21353326265221 has 2 divisors, whose sum is σ = 21353326265222. Its totient is φ = 21353326265220.

The previous prime is 21353326265213. The next prime is 21353326265267. The reversal of 21353326265221 is 12256262335312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16527883702500 + 4825442562721 = 4065450^2 + 2196689^2 .

It is a cyclic number.

It is not a de Polignac number, because 21353326265221 - 2³ = 21353326265213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21353326265281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10676663132610 + 10676663132611.

It is an arithmetic number, because the mean of its divisors is an integer number (10676663132611).

Almost surely, 2^{21353326265221} is an apocalyptic number.

It is an amenable number.

21353326265221 is a deficient number, since it is larger than the sum of its proper divisors (1).

21353326265221 is an equidigital number, since it uses as much as digits as its factorization.

21353326265221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 777600, while the sum is 43.

The spelling of 21353326265221 in words is "twenty-one trillion, three hundred fifty-three billion, three hundred twenty-six million, two hundred sixty-five thousand, two hundred twenty-one".