21516275115 has 48 divisors (see below), whose sum is σ = 38025666432. Its totient is φ = 11250799872.

The previous prime is 21516275101. The next prime is 21516275147. The reversal of 21516275115 is 51157261512.

21516275115 is a `hidden beast` number, since 2 + 1 + 516 + 27 + 5 + 115 = 666.

It is not a de Polignac number, because 21516275115 - 2⁷ = 21516274987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21516275115.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4918069 + ... + 4922441.

It is an arithmetic number, because the mean of its divisors is an integer number (792201384).

Almost surely, 2^21516275115 is an apocalyptic number.

21516275115 is a deficient number, since it is larger than the sum of its proper divisors (16509391317).

21516275115 is a wasteful number, since it uses less digits than its factorization.

21516275115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6500 (or 6497 counting only the distinct ones).

The product of its digits is 21000, while the sum is 36.

The spelling of 21516275115 in words is "twenty-one billion, five hundred sixteen million, two hundred seventy-five thousand, one hundred fifteen".