21120762100 has 36 divisors (see below), whose sum is σ = 46260414144. Its totient is φ = 8369344480.

The previous prime is 21120762067. The next prime is 21120762109. The reversal of 21120762100 is 126702112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120762109) by changing a digit.

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, 976252 + ... + 997651.

It is an arithmetic number, because the mean of its divisors is an integer number (1285011504).

Almost surely, 2^21120762100 is an apocalyptic number.

21120762100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120762100 is an abundant number, since it is smaller than the sum of its proper divisors (25139652044).

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

21120762100 is a wasteful number, since it uses less digits than its factorization.

21120762100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1974024 (or 1974017 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 22.

The spelling of 21120762100 in words is "twenty-one billion, one hundred twenty million, seven hundred sixty-two thousand, one hundred".