21038571524 has 6 divisors (see below), whose sum is σ = 36817500174. Its totient is φ = 10519285760.

The previous prime is 21038571479. The next prime is 21038571641. The reversal of 21038571524 is 42517583012.

It can be written as a sum of positive squares in only one way, i.e., 17257551424 + 3781020100 = 131368^2 + 61490^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2629821437 + ... + 2629821444.

It is an arithmetic number, because the mean of its divisors is an integer number (6136250029).

Almost surely, 2^21038571524 is an apocalyptic number.

It is an amenable number.

21038571524 is a deficient number, since it is larger than the sum of its proper divisors (15778928650).

21038571524 is a wasteful number, since it uses less digits than its factorization.

21038571524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5259642885 (or 5259642883 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 38.

The spelling of 21038571524 in words is "twenty-one billion, thirty-eight million, five hundred seventy-one thousand, five hundred twenty-four".