27421772831 has 2 divisors, whose sum is σ = 27421772832. Its totient is φ = 27421772830.

The previous prime is 27421772723. The next prime is 27421772843. The reversal of 27421772831 is 13827712472.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27421772831 - 2¹⁸ = 27421510687 is a prime.

It is a super-2 number, since 2×27421772831² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27421772891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13710886415 + 13710886416.

It is an arithmetic number, because the mean of its divisors is an integer number (13710886416).

Almost surely, 2^27421772831 is an apocalyptic number.

27421772831 is a deficient number, since it is larger than the sum of its proper divisors (1).

27421772831 is an equidigital number, since it uses as much as digits as its factorization.

27421772831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 263424, while the sum is 44.

The spelling of 27421772831 in words is "twenty-seven billion, four hundred twenty-one million, seven hundred seventy-two thousand, eight hundred thirty-one".