21412993321 has 2 divisors, whose sum is σ = 21412993322. Its totient is φ = 21412993320.

The previous prime is 21412993279. The next prime is 21412993333. The reversal of 21412993321 is 12339921412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20141286400 + 1271706921 = 141920^2 + 35661^2 .

It is a cyclic number.

It is not a de Polignac number, because 21412993321 - 2²⁷ = 21278775593 is a prime.

It is not a weakly prime, because it can be changed into another prime (21412994321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10706496660 + 10706496661.

It is an arithmetic number, because the mean of its divisors is an integer number (10706496661).

Almost surely, 2^21412993321 is an apocalyptic number.

It is an amenable number.

21412993321 is a deficient number, since it is larger than the sum of its proper divisors (1).

21412993321 is an equidigital number, since it uses as much as digits as its factorization.

21412993321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 37.

The spelling of 21412993321 in words is "twenty-one billion, four hundred twelve million, nine hundred ninety-three thousand, three hundred twenty-one".