21223620704 has 72 divisors (see below), whose sum is σ = 49460901840. Its totient is φ = 8904994560.

The previous prime is 21223620689. The next prime is 21223620757. The reversal of 21223620704 is 40702632212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 160484 + ... + 261155.

It is an arithmetic number, because the mean of its divisors is an integer number (686956970).

Almost surely, 2^21223620704 is an apocalyptic number.

It is an amenable number.

21223620704 is an abundant number, since it is smaller than the sum of its proper divisors (28237281136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21223620704 is a wasteful number, since it uses less digits than its factorization.

21223620704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421684 (or 421665 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 29.

The spelling of 21223620704 in words is "twenty-one billion, two hundred twenty-three million, six hundred twenty thousand, seven hundred four".