21112323391 has 2 divisors, whose sum is σ = 21112323392. Its totient is φ = 21112323390.

The previous prime is 21112323311. The next prime is 21112323433. The reversal of 21112323391 is 19332321112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21112323391 - 2¹⁷ = 21112192319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112323311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556161695 + 10556161696.

It is an arithmetic number, because the mean of its divisors is an integer number (10556161696).

Almost surely, 2^21112323391 is an apocalyptic number.

21112323391 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112323391 is an equidigital number, since it uses as much as digits as its factorization.

21112323391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 28.

The spelling of 21112323391 in words is "twenty-one billion, one hundred twelve million, three hundred twenty-three thousand, three hundred ninety-one".