21438604747754 has 16 divisors (see below), whose sum is σ = 32402128741128. Its totient is φ = 10637941024512.

The previous prime is 21438604747741. The next prime is 21438604747771. The reversal of 21438604747754 is 45774740683412.

It can be written as a sum of positive squares in 4 ways, for example, as 21438242721025 + 362026729 = 4630145^2 + 19027^2 .

It is a super-2 number, since 2×21438604747754² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10527347 + ... + 12397670.

Almost surely, 2^{21438604747754} is an apocalyptic number.

21438604747754 is a deficient number, since it is larger than the sum of its proper divisors (10963523993374).

21438604747754 is a wasteful number, since it uses less digits than its factorization.

21438604747754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22928569.

The product of its (nonzero) digits is 126443520, while the sum is 62.

The spelling of 21438604747754 in words is "twenty-one trillion, four hundred thirty-eight billion, six hundred four million, seven hundred forty-seven thousand, seven hundred fifty-four".