21373537756774 has 32 divisors (see below), whose sum is σ = 37155502094400. Its totient is φ = 9032197175808.

The previous prime is 21373537756759. The next prime is 21373537756783. The reversal of 21373537756774 is 47765773537312.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37109047 + ... + 37680610.

It is an arithmetic number, because the mean of its divisors is an integer number (1161109440450).

Almost surely, 2^{21373537756774} is an apocalyptic number.

21373537756774 is a deficient number, since it is larger than the sum of its proper divisors (15781964337626).

21373537756774 is a wasteful number, since it uses less digits than its factorization.

21373537756774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74789952.

The product of its digits is 544546800, while the sum is 67.

The spelling of 21373537756774 in words is "twenty-one trillion, three hundred seventy-three billion, five hundred thirty-seven million, seven hundred fifty-six thousand, seven hundred seventy-four".