21272113047965 has 16 divisors (see below), whose sum is σ = 28438050337200. Its totient is φ = 15166960177152.

The previous prime is 21272113047949. The next prime is 21272113048009. The reversal of 21272113047965 is 56974031127212.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 6739106968441 + 14533006079524 = 2595979^2 + 3812218^2 .

It is a cyclic number.

It is not a de Polignac number, because 21272113047965 - 2⁴ = 21272113047949 is a prime.

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, 5642468420 + ... + 5642472189.

It is an arithmetic number, because the mean of its divisors is an integer number (1777378146075).

Almost surely, 2^{21272113047965} is an apocalyptic number.

It is an amenable number.

21272113047965 is a deficient number, since it is larger than the sum of its proper divisors (7165937289235).

21272113047965 is a wasteful number, since it uses less digits than its factorization.

21272113047965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11284940656.

The product of its (nonzero) digits is 1270080, while the sum is 50.

The spelling of 21272113047965 in words is "twenty-one trillion, two hundred seventy-two billion, one hundred thirteen million, forty-seven thousand, nine hundred sixty-five".