21152502221269 has 2 divisors, whose sum is σ = 21152502221270. Its totient is φ = 21152502221268.

The previous prime is 21152502221233. The next prime is 21152502221281. The reversal of 21152502221269 is 96212220525112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20680893140625 + 471609080644 = 4547625^2 + 686738^2 .

It is a cyclic number.

It is not a de Polignac number, because 21152502221269 - 2²⁵ = 21152468666837 is a prime.

It is a super-2 number, since 2×21152502221269² (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 (21152502221369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10576251110634 + 10576251110635.

It is an arithmetic number, because the mean of its divisors is an integer number (10576251110635).

Almost surely, 2^{21152502221269} is an apocalyptic number.

It is an amenable number.

21152502221269 is a deficient number, since it is larger than the sum of its proper divisors (1).

21152502221269 is an equidigital number, since it uses as much as digits as its factorization.

21152502221269 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86400, while the sum is 40.

The spelling of 21152502221269 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred two million, two hundred twenty-one thousand, two hundred sixty-nine".