21437568326329 has 2 divisors, whose sum is σ = 21437568326330. Its totient is φ = 21437568326328.

The previous prime is 21437568326287. The next prime is 21437568326341. The reversal of 21437568326329 is 92362386573412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19895123556025 + 1542444770304 = 4460395^2 + 1241952^2 .

It is a cyclic number.

It is not a de Polignac number, because 21437568326329 - 2³⁷ = 21300129372857 is a prime.

It is not a weakly prime, because it can be changed into another prime (21437568326399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10718784163164 + 10718784163165.

It is an arithmetic number, because the mean of its divisors is an integer number (10718784163165).

Almost surely, 2^{21437568326329} is an apocalyptic number.

It is an amenable number.

21437568326329 is a deficient number, since it is larger than the sum of its proper divisors (1).

21437568326329 is an equidigital number, since it uses as much as digits as its factorization.

21437568326329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78382080, while the sum is 61.

The spelling of 21437568326329 in words is "twenty-one trillion, four hundred thirty-seven billion, five hundred sixty-eight million, three hundred twenty-six thousand, three hundred twenty-nine".