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21111002000 = 2453116115731
BaseRepresentation
bin10011101010010100…
…000101001110010000
32000111021002000110222
4103222110011032100
5321213404031000
613410454012212
71345102361534
oct235224051620
960437060428
1021111002000
118a536792a0
124112047068
131cb590b27a
141043a89bc4
15838576a85
hex4ea505390

21111002000 has 160 divisors (see below), whose sum is σ = 56603484288. Its totient is φ = 7550400000.

The previous prime is 21111001993. The next prime is 21111002039. The reversal of 21111002000 is 20011112.

Adding to 21111002000 its reverse (20011112), we get a palindrome (21131013112).

It is a Harshad number since it is a multiple of its sum of digits (8).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1334135 + ... + 1349865.

Almost surely, 221111002000 is an apocalyptic number.

21111002000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21111002000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28301742144).

21111002000 is an abundant number, since it is smaller than the sum of its proper divisors (35492482288).

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

21111002000 is a wasteful number, since it uses less digits than its factorization.

21111002000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15826 (or 15810 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

The spelling of 21111002000 in words is "twenty-one billion, one hundred eleven million, two thousand".