21502703044 has 27 divisors (see below), whose sum is σ = 37952204493. Its totient is φ = 10659996048.

The previous prime is 21502703039. The next prime is 21502703071. The reversal of 21502703044 is 44030720512.

The square root of 21502703044 is 146638.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 6302772100 + 15199930944 = 79390^2 + 123288^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 46044099 + ... + 46044565.

Almost surely, 2^21502703044 is an apocalyptic number.

21502703044 is the 146638-th square number.

It is an amenable number.

21502703044 is a deficient number, since it is larger than the sum of its proper divisors (16449501449).

21502703044 is an frugal number, since it uses more digits than its factorization.

21502703044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1252 (or 626 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

The spelling of 21502703044 in words is "twenty-one billion, five hundred two million, seven hundred three thousand, forty-four".