21552246724 has 6 divisors (see below), whose sum is σ = 37716431774. Its totient is φ = 10776123360.

The previous prime is 21552246721. The next prime is 21552246733. The reversal of 21552246724 is 42764225512.

It can be written as a sum of positive squares in only one way, i.e., 18670489600 + 2881757124 = 136640^2 + 53682^2 .

It is not an unprimeable number, because it can be changed into a prime (21552246721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2694030837 + ... + 2694030844.

Almost surely, 2^21552246724 is an apocalyptic number.

It is an amenable number.

21552246724 is a deficient number, since it is larger than the sum of its proper divisors (16164185050).

21552246724 is a wasteful number, since it uses less digits than its factorization.

21552246724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5388061685 (or 5388061683 counting only the distinct ones).

The product of its digits is 268800, while the sum is 40.

The spelling of 21552246724 in words is "twenty-one billion, five hundred fifty-two million, two hundred forty-six thousand, seven hundred twenty-four".