21600373831 has 2 divisors, whose sum is σ = 21600373832. Its totient is φ = 21600373830.

The previous prime is 21600373793. The next prime is 21600373841. The reversal of 21600373831 is 13837300612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21600373831 - 2²³ = 21591985223 is a prime.

It is a super-2 number, since 2×21600373831² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21600373841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10800186915 + 10800186916.

It is an arithmetic number, because the mean of its divisors is an integer number (10800186916).

Almost surely, 2^21600373831 is an apocalyptic number.

21600373831 is a deficient number, since it is larger than the sum of its proper divisors (1).

21600373831 is an equidigital number, since it uses as much as digits as its factorization.

21600373831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 34.

The spelling of 21600373831 in words is "twenty-one billion, six hundred million, three hundred seventy-three thousand, eight hundred thirty-one".