21062118100 has 72 divisors (see below), whose sum is σ = 46810941408. Its totient is φ = 8221315200.

The previous prime is 21062118073. The next prime is 21062118113. The reversal of 21062118100 is 181126012.

It is a super-2 number, since 2×21062118100² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7682730 + ... + 7685470.

It is an arithmetic number, because the mean of its divisors is an integer number (650151964).

Almost surely, 2^21062118100 is an apocalyptic number.

21062118100 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 21062118100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23405470704).

21062118100 is an abundant number, since it is smaller than the sum of its proper divisors (25748823308).

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

21062118100 is a wasteful number, since it uses less digits than its factorization.

21062118100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4585 (or 4578 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 22.

The spelling of 21062118100 in words is "twenty-one billion, sixty-two million, one hundred eighteen thousand, one hundred".