21399334031 has 2 divisors, whose sum is σ = 21399334032. Its totient is φ = 21399334030.

The previous prime is 21399333973. The next prime is 21399334051. The reversal of 21399334031 is 13043399312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21399334031 - 2¹⁸ = 21399071887 is a prime.

It is a super-2 number, since 2×21399334031² (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 (21399334051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10699667015 + 10699667016.

It is an arithmetic number, because the mean of its divisors is an integer number (10699667016).

Almost surely, 2^21399334031 is an apocalyptic number.

21399334031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21399334031 is an equidigital number, since it uses as much as digits as its factorization.

21399334031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 38.

The spelling of 21399334031 in words is "twenty-one billion, three hundred ninety-nine million, three hundred thirty-four thousand, thirty-one".