21213612523231 has 2 divisors, whose sum is σ = 21213612523232. Its totient is φ = 21213612523230.

The previous prime is 21213612523199. The next prime is 21213612523237. The reversal of 21213612523231 is 13232521631212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21213612523231 - 2⁵ = 21213612523199 is a prime.

It is a super-2 number, since 2×21213612523231² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21213612523237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606806261615 + 10606806261616.

It is an arithmetic number, because the mean of its divisors is an integer number (10606806261616).

Almost surely, 2^{21213612523231} is an apocalyptic number.

21213612523231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213612523231 is an equidigital number, since it uses as much as digits as its factorization.

21213612523231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 34.

The spelling of 21213612523231 in words is "twenty-one trillion, two hundred thirteen billion, six hundred twelve million, five hundred twenty-three thousand, two hundred thirty-one".