21527695331 has 2 divisors, whose sum is σ = 21527695332. Its totient is φ = 21527695330.

The previous prime is 21527695261. The next prime is 21527695333. The reversal of 21527695331 is 13359672512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21527695331 is a prime.

It is a super-2 number, since 2×21527695331² (a number of 21 digits) contains 22 as substring.

Together with 21527695333, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21527695333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10763847665 + 10763847666.

It is an arithmetic number, because the mean of its divisors is an integer number (10763847666).

Almost surely, 2^21527695331 is an apocalyptic number.

21527695331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21527695331 is an equidigital number, since it uses as much as digits as its factorization.

21527695331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 340200, while the sum is 44.

The spelling of 21527695331 in words is "twenty-one billion, five hundred twenty-seven million, six hundred ninety-five thousand, three hundred thirty-one".