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21201211012100 = 2252730287444303
BaseRepresentation
bin1001101001000010010101…
…01001101011010000000100
32210001211000211220101221012
410310201022221223100010
510234330040004341400
6113031411334541352
74315510526116310
oct464411251532004
983054024811835
1021201211012100
1168344239a1479
122464b2a807858
13baa35b74a342
14534203540b40
1526b75b034d35
hex13484aa6b404

21201211012100 has 36 divisors (see below), whose sum is σ = 52579003311744. Its totient is φ = 7268986632480.

The previous prime is 21201211012099. The next prime is 21201211012153. The reversal of 21201211012100 is 121011210212.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15143721452 + ... + 15143722851.

Almost surely, 221201211012100 is an apocalyptic number.

21201211012100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21201211012100 is an abundant number, since it is smaller than the sum of its proper divisors (31377792299644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21201211012100 is a wasteful number, since it uses less digits than its factorization.

21201211012100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30287444324 (or 30287444317 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21201211012100 its reverse (121011210212), we get a palindrome (21322222222312).

The spelling of 21201211012100 in words is "twenty-one trillion, two hundred one billion, two hundred eleven million, twelve thousand, one hundred".

Divisors: 1 2 4 5 7 10 14 20 25 28 35 50 70 100 140 175 350 700 30287444303 60574888606 121149777212 151437221515 212012110121 302874443030 424024220242 605748886060 757186107575 848048440484 1060060550605 1514372215150 2120121101210 3028744430300 4240242202420 5300302753025 10600605506050 21201211012100