21174265761 has 64 divisors (see below), whose sum is σ = 32741646336. Its totient is φ = 12050035200.

The previous prime is 21174265757. The next prime is 21174265781. The reversal of 21174265761 is 16756247112.

It is not a de Polignac number, because 21174265761 - 2² = 21174265757 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21174265781) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 22218061 + ... + 22219013.

It is an arithmetic number, because the mean of its divisors is an integer number (511588224).

Almost surely, 2^21174265761 is an apocalyptic number.

It is an amenable number.

21174265761 is a deficient number, since it is larger than the sum of its proper divisors (11567380575).

21174265761 is a wasteful number, since it uses less digits than its factorization.

21174265761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1622.

The product of its digits is 141120, while the sum is 42.

The spelling of 21174265761 in words is "twenty-one billion, one hundred seventy-four million, two hundred sixty-five thousand, seven hundred sixty-one".