21323212291 has 2 divisors, whose sum is σ = 21323212292. Its totient is φ = 21323212290.

The previous prime is 21323212283. The next prime is 21323212363. The reversal of 21323212291 is 19221232312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21323212291 - 2³ = 21323212283 is a prime.

It is not a weakly prime, because it can be changed into another prime (21323212201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661606145 + 10661606146.

It is an arithmetic number, because the mean of its divisors is an integer number (10661606146).

Almost surely, 2^21323212291 is an apocalyptic number.

21323212291 is a deficient number, since it is larger than the sum of its proper divisors (1).

21323212291 is an equidigital number, since it uses as much as digits as its factorization.

21323212291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 28.

The spelling of 21323212291 in words is "twenty-one billion, three hundred twenty-three million, two hundred twelve thousand, two hundred ninety-one".