21574212544 has 14 divisors (see below), whose sum is σ = 42811328144. Its totient is φ = 10787106240.

The previous prime is 21574212529. The next prime is 21574212547. The reversal of 21574212544 is 44521247512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21574212547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 168548472 + ... + 168548599.

Almost surely, 2^21574212544 is an apocalyptic number.

It is an amenable number.

21574212544 is a deficient number, since it is larger than the sum of its proper divisors (21237115600).

21574212544 is an equidigital number, since it uses as much as digits as its factorization.

21574212544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337097083 (or 337097073 counting only the distinct ones).

The product of its digits is 89600, while the sum is 37.

The spelling of 21574212544 in words is "twenty-one billion, five hundred seventy-four million, two hundred twelve thousand, five hundred forty-four".