21348508576 has 24 divisors (see below), whose sum is σ = 42134714244. Its totient is φ = 10647628800.

The previous prime is 21348508561. The next prime is 21348508583. The reversal of 21348508576 is 67580584312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20534890000 + 813618576 = 143300^2 + 28524^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

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, 819015 + ... + 844678.

Almost surely, 2^21348508576 is an apocalyptic number.

It is an amenable number.

21348508576 is a deficient number, since it is larger than the sum of its proper divisors (20786205668).

21348508576 is a wasteful number, since it uses less digits than its factorization.

21348508576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1664104 (or 1664096 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 49.

The spelling of 21348508576 in words is "twenty-one billion, three hundred forty-eight million, five hundred eight thousand, five hundred seventy-six".