21520767304 has 64 divisors (see below), whose sum is σ = 41950886400. Its totient is φ = 10344672000.

The previous prime is 21520767287. The next prime is 21520767353. The reversal of 21520767304 is 40376702512.

It is a happy number.

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, 3890989 + ... + 3896515.

It is an arithmetic number, because the mean of its divisors is an integer number (655482600).

Almost surely, 2^21520767304 is an apocalyptic number.

It is an amenable number.

21520767304 is a deficient number, since it is larger than the sum of its proper divisors (20430119096).

21520767304 is a wasteful number, since it uses less digits than its factorization.

21520767304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5774 (or 5770 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 37.

The spelling of 21520767304 in words is "twenty-one billion, five hundred twenty million, seven hundred sixty-seven thousand, three hundred four".