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21020012110 = 2523106186137
BaseRepresentation
bin10011100100111000…
…111110111001001110
32000020220212020211001
4103210320332321032
5321022110341420
613353443450514
71342616104066
oct234470767116
960226766731
1021020012110
118a07281239
1240a7686a3a
131c9cb008b6
1410359623a6
158305a1b0a
hex4e4e3ee4e

21020012110 has 32 divisors (see below), whose sum is σ = 39518736192. Its totient is φ = 8034766080.

The previous prime is 21020012099. The next prime is 21020012129. The reversal of 21020012110 is 1121002012.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 200962 + ... + 287098.

It is an arithmetic number, because the mean of its divisors is an integer number (1234960506).

Almost surely, 221020012110 is an apocalyptic number.

21020012110 is a deficient number, since it is larger than the sum of its proper divisors (18498724082).

21020012110 is a wasteful number, since it uses less digits than its factorization.

21020012110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87228.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21020012110 its reverse (1121002012), we get a palindrome (22141014122).

The spelling of 21020012110 in words is "twenty-one billion, twenty million, twelve thousand, one hundred ten".

Divisors: 1 2 5 10 23 46 115 230 1061 2122 5305 10610 24403 48806 86137 122015 172274 244030 430685 861370 1981151 3962302 9905755 19811510 91391357 182782714 456956785 913913570 2102001211 4204002422 10510006055 21020012110