21869351522 has 18 divisors (see below), whose sum is σ = 33451604067. Its totient is φ = 10722923536.

The previous prime is 21869351489. The next prime is 21869351527. The reversal of 21869351522 is 22515396812.

It can be written as a sum of positive squares in 5 ways, for example, as 9314373121 + 12554978401 = 96511^2 + 112049^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=104569.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21869351527) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 11083328 + ... + 11085300.

Almost surely, 2^21869351522 is an apocalyptic number.

21869351522 is a deficient number, since it is larger than the sum of its proper divisors (11582252545).

21869351522 is an frugal number, since it uses more digits than its factorization.

21869351522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4054 (or 2028 counting only the distinct ones).

The product of its digits is 259200, while the sum is 44.

The spelling of 21869351522 in words is "twenty-one billion, eight hundred sixty-nine million, three hundred fifty-one thousand, five hundred twenty-two".