21504642364 has 12 divisors (see below), whose sum is σ = 37634269288. Its totient is φ = 10751994000.

The previous prime is 21504642361. The next prime is 21504642389. The reversal of 21504642364 is 46324640512.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21504642361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123139 + ... + 241189.

Almost surely, 2^21504642364 is an apocalyptic number.

It is an amenable number.

21504642364 is a deficient number, since it is larger than the sum of its proper divisors (16129626924).

21504642364 is a wasteful number, since it uses less digits than its factorization.

21504642364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163596 (or 163594 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 37.

The spelling of 21504642364 in words is "twenty-one billion, five hundred four million, six hundred forty-two thousand, three hundred sixty-four".