21405270337832 has 16 divisors (see below), whose sum is σ = 40792830767700. Its totient is φ = 10527182133120.

The previous prime is 21405270337819. The next prime is 21405270337931. The reversal of 21405270337832 is 23873307250412.

It can be written as a sum of positive squares in 2 ways, for example, as 12948957553156 + 8456312784676 = 3598466^2 + 2907974^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21931628957 + ... + 21931629932.

Almost surely, 2^{21405270337832} is an apocalyptic number.

It is an amenable number.

21405270337832 is a deficient number, since it is larger than the sum of its proper divisors (19387560429868).

21405270337832 is a wasteful number, since it uses less digits than its factorization.

21405270337832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43863258956 (or 43863258952 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 47.

The spelling of 21405270337832 in words is "twenty-one trillion, four hundred five billion, two hundred seventy million, three hundred thirty-seven thousand, eight hundred thirty-two".