21050051304 has 64 divisors (see below), whose sum is σ = 56906323200. Its totient is φ = 6463422464.

The previous prime is 21050051293. The next prime is 21050051339. The reversal of 21050051304 is 40315005012.

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, 529689 + ... + 568040.

It is an arithmetic number, because the mean of its divisors is an integer number (889161300).

Almost surely, 2^21050051304 is an apocalyptic number.

21050051304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21050051304 is an abundant number, since it is smaller than the sum of its proper divisors (35856271896).

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

21050051304 is a wasteful number, since it uses less digits than its factorization.

21050051304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097802 (or 1097798 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

Adding to 21050051304 its reverse (40315005012), we get a palindrome (61365056316).

The spelling of 21050051304 in words is "twenty-one billion, fifty million, fifty-one thousand, three hundred four".