21233111931373 has 2 divisors, whose sum is σ = 21233111931374. Its totient is φ = 21233111931372.

The previous prime is 21233111931371. The next prime is 21233111931377. The reversal of 21233111931373 is 37313911133212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14766481627524 + 6466630303849 = 3842718^2 + 2542957^2 .

It is a cyclic number.

It is not a de Polignac number, because 21233111931373 - 2¹ = 21233111931371 is a prime.

Together with 21233111931371, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21233111931371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616555965686 + 10616555965687.

It is an arithmetic number, because the mean of its divisors is an integer number (10616555965687).

Almost surely, 2^{21233111931373} is an apocalyptic number.

It is an amenable number.

21233111931373 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233111931373 is an equidigital number, since it uses as much as digits as its factorization.

21233111931373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61236, while the sum is 40.

The spelling of 21233111931373 in words is "twenty-one trillion, two hundred thirty-three billion, one hundred eleven million, nine hundred thirty-one thousand, three hundred seventy-three".