21235185004 has 48 divisors (see below), whose sum is σ = 43478830080. Its totient is φ = 8971784640.

The previous prime is 21235184963. The next prime is 21235185031. The reversal of 21235185004 is 40058153212.

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, 195324 + ... + 283939.

It is an arithmetic number, because the mean of its divisors is an integer number (905808960).

Almost surely, 2^21235185004 is an apocalyptic number.

It is an amenable number.

21235185004 is an abundant number, since it is smaller than the sum of its proper divisors (22243645076).

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

21235185004 is a wasteful number, since it uses less digits than its factorization.

21235185004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479350 (or 479348 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

The spelling of 21235185004 in words is "twenty-one billion, two hundred thirty-five million, one hundred eighty-five thousand, four".