21152530521307 has 16 divisors (see below), whose sum is σ = 22434800652000. Its totient is φ = 19908984824064.

The previous prime is 21152530521289. The next prime is 21152530521359. The reversal of 21152530521307 is 70312503525112.

It is a cyclic number.

It is not a de Polignac number, because 21152530521307 - 2²⁷ = 21152396303579 is a prime.

It is a super-3 number, since 3×21152530521307³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21152530527307) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16028082 + ... + 17297527.

It is an arithmetic number, because the mean of its divisors is an integer number (1402175040750).

Almost surely, 2^{21152530521307} is an apocalyptic number.

21152530521307 is a deficient number, since it is larger than the sum of its proper divisors (1282270130693).

21152530521307 is a wasteful number, since it uses less digits than its factorization.

21152530521307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33326190.

The product of its (nonzero) digits is 63000, while the sum is 37.

The spelling of 21152530521307 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred thirty million, five hundred twenty-one thousand, three hundred seven".