21320000329 has 2 divisors, whose sum is σ = 21320000330. Its totient is φ = 21320000328.

The previous prime is 21320000309. The next prime is 21320000341. The reversal of 21320000329 is 92300002312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20142137929 + 1177862400 = 141923^2 + 34320^2 .

It is a cyclic number.

It is not a de Polignac number, because 21320000329 - 2²⁷ = 21185782601 is a prime.

It is not a weakly prime, because it can be changed into another prime (21320000309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660000164 + 10660000165.

It is an arithmetic number, because the mean of its divisors is an integer number (10660000165).

Almost surely, 2^21320000329 is an apocalyptic number.

It is an amenable number.

21320000329 is a deficient number, since it is larger than the sum of its proper divisors (1).

21320000329 is an equidigital number, since it uses as much as digits as its factorization.

21320000329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 22.

The spelling of 21320000329 in words is "twenty-one billion, three hundred twenty million, three hundred twenty-nine", and thus it is an aban number.