21530544525115 has 32 divisors (see below), whose sum is σ = 26180610281280. Its totient is φ = 16995660847104.

The previous prime is 21530544525019. The next prime is 21530544525163. The reversal of 21530544525115 is 51152544503512.

It is a cyclic number.

It is not a de Polignac number, because 21530544525115 - 2⁹ = 21530544524603 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1788690877 + ... + 1788702913.

It is an arithmetic number, because the mean of its divisors is an integer number (818144071290).

Almost surely, 2^{21530544525115} is an apocalyptic number.

21530544525115 is a deficient number, since it is larger than the sum of its proper divisors (4650065756165).

21530544525115 is a wasteful number, since it uses less digits than its factorization.

21530544525115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17151.

The product of its (nonzero) digits is 600000, while the sum is 43.

The spelling of 21530544525115 in words is "twenty-one trillion, five hundred thirty billion, five hundred forty-four million, five hundred twenty-five thousand, one hundred fifteen".