21315834814441 has 2 divisors, whose sum is σ = 21315834814442. Its totient is φ = 21315834814440.

The previous prime is 21315834814433. The next prime is 21315834814459. The reversal of 21315834814441 is 14441843851312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18968672932416 + 2347161882025 = 4355304^2 + 1532045^2 .

It is a cyclic number.

It is not a de Polignac number, because 21315834814441 - 2³ = 21315834814433 is a prime.

It is not a weakly prime, because it can be changed into another prime (21315834814481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10657917407220 + 10657917407221.

It is an arithmetic number, because the mean of its divisors is an integer number (10657917407221).

Almost surely, 2^{21315834814441} is an apocalyptic number.

It is an amenable number.

21315834814441 is a deficient number, since it is larger than the sum of its proper divisors (1).

21315834814441 is an equidigital number, since it uses as much as digits as its factorization.

21315834814441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1474560, while the sum is 49.

The spelling of 21315834814441 in words is "twenty-one trillion, three hundred fifteen billion, eight hundred thirty-four million, eight hundred fourteen thousand, four hundred forty-one".