21272465097 has 12 divisors (see below), whose sum is σ = 33090501444. Its totient is φ = 13090747680.

The previous prime is 21272465083. The next prime is 21272465117. The reversal of 21272465097 is 79056427212.

It can be written as a sum of positive squares in 2 ways, for example, as 13853054601 + 7419410496 = 117699^2 + 86136^2 .

It is not a de Polignac number, because 21272465097 - 2⁸ = 21272464841 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21272465017) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90907854 + ... + 90908087.

It is an arithmetic number, because the mean of its divisors is an integer number (2757541787).

Almost surely, 2^21272465097 is an apocalyptic number.

It is an amenable number.

21272465097 is a deficient number, since it is larger than the sum of its proper divisors (11818036347).

21272465097 is a wasteful number, since it uses less digits than its factorization.

21272465097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181815960 (or 181815957 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The spelling of 21272465097 in words is "twenty-one billion, two hundred seventy-two million, four hundred sixty-five thousand, ninety-seven".