21123010032 has 80 divisors (see below), whose sum is σ = 55020362400. Its totient is φ = 6982758400.

The previous prime is 21123010019. The next prime is 21123010037. The reversal of 21123010032 is 23001032112.

It is a junction number, because it is equal to n+sod(n) for n = 21123009993 and 21123010020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123010037) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5440732 + ... + 5444612.

It is an arithmetic number, because the mean of its divisors is an integer number (687754530).

Almost surely, 2^21123010032 is an apocalyptic number.

It is an amenable number.

21123010032 is an abundant number, since it is smaller than the sum of its proper divisors (33897352368).

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

21123010032 is a wasteful number, since it uses less digits than its factorization.

21123010032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4802 (or 4796 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21123010032 its reverse (23001032112), we get a palindrome (44124042144).

The spelling of 21123010032 in words is "twenty-one billion, one hundred twenty-three million, ten thousand, thirty-two".