21152502221265 has 64 divisors (see below), whose sum is σ = 40022778585600. Its totient is φ = 10562712256512.

The previous prime is 21152502221233. The next prime is 21152502221269. The reversal of 21152502221265 is 56212220525112.

21152502221265 is a `hidden beast` number, since 2 + 1 + 1 + 5 + 2 + 502 + 22 + 126 + 5 = 666.

It is not a de Polignac number, because 21152502221265 - 2⁵ = 21152502221233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21152502221269) 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 63 ways as a sum of consecutive naturals, for example, 23434725 + ... + 24320594.

It is an arithmetic number, because the mean of its divisors is an integer number (625355915400).

Almost surely, 2^{21152502221265} is an apocalyptic number.

It is an amenable number.

21152502221265 is a deficient number, since it is larger than the sum of its proper divisors (18870276364335).

21152502221265 is a wasteful number, since it uses less digits than its factorization.

21152502221265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47755543 (or 47755537 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

Adding to 21152502221265 its reverse (56212220525112), we get a palindrome (77364722746377).

The spelling of 21152502221265 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred two million, two hundred twenty-one thousand, two hundred sixty-five".