21004234120 has 64 divisors (see below), whose sum is σ = 47508476400. Its totient is φ = 8357544960.

The previous prime is 21004234117. The next prime is 21004234183. The reversal of 21004234120 is 2143240012.

It can be written as a sum of positive squares in 8 ways, for example, as 6717769444 + 14286464676 = 81962^2 + 119526^2 .

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, 9095526 + ... + 9097834.

Almost surely, 2^21004234120 is an apocalyptic number.

21004234120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21004234120 is an abundant number, since it is smaller than the sum of its proper divisors (26504242280).

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

21004234120 is a wasteful number, since it uses less digits than its factorization.

21004234120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3418 (or 3414 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21004234120 its reverse (2143240012), we get a palindrome (23147474132).

The spelling of 21004234120 in words is "twenty-one billion, four million, two hundred thirty-four thousand, one hundred twenty".