21332608943 has 2 divisors, whose sum is σ = 21332608944. Its totient is φ = 21332608942.

The previous prime is 21332608897. The next prime is 21332608949. The reversal of 21332608943 is 34980623312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21332608943 - 2⁶ = 21332608879 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21332608943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21332608949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10666304471 + 10666304472.

It is an arithmetic number, because the mean of its divisors is an integer number (10666304472).

Almost surely, 2^21332608943 is an apocalyptic number.

21332608943 is a deficient number, since it is larger than the sum of its proper divisors (1).

21332608943 is an equidigital number, since it uses as much as digits as its factorization.

21332608943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 41.

The spelling of 21332608943 in words is "twenty-one billion, three hundred thirty-two million, six hundred eight thousand, nine hundred forty-three".