21526457033413 has 2 divisors, whose sum is σ = 21526457033414. Its totient is φ = 21526457033412.

The previous prime is 21526457033309. The next prime is 21526457033437. The reversal of 21526457033413 is 31433075462512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18950759443009 + 2575697590404 = 4353247^2 + 1604898^2 .

It is a cyclic number.

It is not a de Polignac number, because 21526457033413 - 2¹⁷ = 21526456902341 is a prime.

It is a super-2 number, since 2×21526457033413² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21526457133413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10763228516706 + 10763228516707.

It is an arithmetic number, because the mean of its divisors is an integer number (10763228516707).

Almost surely, 2^{21526457033413} is an apocalyptic number.

It is an amenable number.

21526457033413 is a deficient number, since it is larger than the sum of its proper divisors (1).

21526457033413 is an equidigital number, since it uses as much as digits as its factorization.

21526457033413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1814400, while the sum is 46.

The spelling of 21526457033413 in words is "twenty-one trillion, five hundred twenty-six billion, four hundred fifty-seven million, thirty-three thousand, four hundred thirteen".