21264947404 has 6 divisors (see below), whose sum is σ = 37213657964. Its totient is φ = 10632473700.

The previous prime is 21264947339. The next prime is 21264947441. The reversal of 21264947404 is 40474946212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2658118422 + ... + 2658118429.

Almost surely, 2^21264947404 is an apocalyptic number.

It is an amenable number.

21264947404 is a deficient number, since it is larger than the sum of its proper divisors (15948710560).

21264947404 is a wasteful number, since it uses less digits than its factorization.

21264947404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5316236855 (or 5316236853 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 43.

The spelling of 21264947404 in words is "twenty-one billion, two hundred sixty-four million, nine hundred forty-seven thousand, four hundred four".