21542667364 has 12 divisors (see below), whose sum is σ = 37724997100. Its totient is φ = 10764096768.

The previous prime is 21542667331. The next prime is 21542667407. The reversal of 21542667364 is 46376624512.

It can be written as a sum of positive squares in 2 ways, for example, as 4860878400 + 16681788964 = 69720^2 + 129158^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1802529 + ... + 1814440.

Almost surely, 2^21542667364 is an apocalyptic number.

It is an amenable number.

21542667364 is a deficient number, since it is larger than the sum of its proper divisors (16182329736).

21542667364 is a wasteful number, since it uses less digits than its factorization.

21542667364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3618462 (or 3618460 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 46.

The spelling of 21542667364 in words is "twenty-one billion, five hundred forty-two million, six hundred sixty-seven thousand, three hundred sixty-four".