21152540515563 has 48 divisors (see below), whose sum is σ = 31512643418880. Its totient is φ = 13665920049600.

The previous prime is 21152540515559. The next prime is 21152540515597. The reversal of 21152540515563 is 36551504525112.

21152540515563 is a `hidden beast` number, since 2 + 1 + 1 + 5 + 2 + 5 + 40 + 51 + 556 + 3 = 666.

It is not a de Polignac number, because 21152540515563 - 2² = 21152540515559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21152540515543) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 413667508 + ... + 413718638.

It is an arithmetic number, because the mean of its divisors is an integer number (656513404560).

Almost surely, 2^{21152540515563} is an apocalyptic number.

21152540515563 is a deficient number, since it is larger than the sum of its proper divisors (10360102903317).

21152540515563 is a wasteful number, since it uses less digits than its factorization.

21152540515563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62240 (or 62237 counting only the distinct ones).

The product of its (nonzero) digits is 900000, while the sum is 45.

The spelling of 21152540515563 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred forty million, five hundred fifteen thousand, five hundred sixty-three".