21514622644 has 6 divisors (see below), whose sum is σ = 37650589634. Its totient is φ = 10757311320.

The previous prime is 21514622627. The next prime is 21514622653. The reversal of 21514622644 is 44622641512.

It can be written as a sum of positive squares in only one way, i.e., 14849859600 + 6664763044 = 121860^2 + 81638^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2689327827 + ... + 2689327834.

Almost surely, 2^21514622644 is an apocalyptic number.

It is an amenable number.

21514622644 is a deficient number, since it is larger than the sum of its proper divisors (16135966990).

21514622644 is a wasteful number, since it uses less digits than its factorization.

21514622644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5378655665 (or 5378655663 counting only the distinct ones).

The product of its digits is 92160, while the sum is 37.

The spelling of 21514622644 in words is "twenty-one billion, five hundred fourteen million, six hundred twenty-two thousand, six hundred forty-four".