21152530521297 has 36 divisors (see below), whose sum is σ = 35622968684160. Its totient is φ = 12059626792752.

The previous prime is 21152530521289. The next prime is 21152530521359. The reversal of 21152530521297 is 79212503525112.

21152530521297 is a `hidden beast` number, since 2 + 1 + 1 + 5 + 2 + 5 + 30 + 521 + 2 + 97 = 666.

It is not a de Polignac number, because 21152530521297 - 2³ = 21152530521289 is a prime.

It is a super-2 number, since 2×21152530521297² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21152530521257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 54436153 + ... + 54823350.

Almost surely, 2^{21152530521297} is an apocalyptic number.

It is an amenable number.

21152530521297 is a deficient number, since it is larger than the sum of its proper divisors (14470438162863).

21152530521297 is a wasteful number, since it uses less digits than its factorization.

21152530521297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109259962 (or 109259952 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 45.

The spelling of 21152530521297 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred thirty million, five hundred twenty-one thousand, two hundred ninety-seven".