21274131327 has 4 divisors (see below), whose sum is σ = 28365508440. Its totient is φ = 14182754216.

The previous prime is 21274131301. The next prime is 21274131349. The reversal of 21274131327 is 72313147212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21274131327 - 2²² = 21269937023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21274131367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3545688552 + ... + 3545688557.

It is an arithmetic number, because the mean of its divisors is an integer number (7091377110).

Almost surely, 2^21274131327 is an apocalyptic number.

21274131327 is a deficient number, since it is larger than the sum of its proper divisors (7091377113).

21274131327 is an equidigital number, since it uses as much as digits as its factorization.

21274131327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7091377112.

The product of its digits is 14112, while the sum is 33.

Adding to 21274131327 its reverse (72313147212), we get a palindrome (93587278539).

The spelling of 21274131327 in words is "twenty-one billion, two hundred seventy-four million, one hundred thirty-one thousand, three hundred twenty-seven".