21915514804 has 12 divisors (see below), whose sum is σ = 38362183524. Its totient is φ = 10954890944.

The previous prime is 21915514783. The next prime is 21915514811. The reversal of 21915514804 is 40841551912.

It can be written as a sum of positive squares in 2 ways, for example, as 13468066704 + 8447448100 = 116052^2 + 91910^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 699367 + ... + 730030.

It is an arithmetic number, because the mean of its divisors is an integer number (3196848627).

Almost surely, 2^21915514804 is an apocalyptic number.

It is an amenable number.

21915514804 is a deficient number, since it is larger than the sum of its proper divisors (16446668720).

21915514804 is a wasteful number, since it uses less digits than its factorization.

21915514804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1433234 (or 1433232 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 40.

The spelling of 21915514804 in words is "twenty-one billion, nine hundred fifteen million, five hundred fourteen thousand, eight hundred four".