21116525211 has 24 divisors (see below), whose sum is σ = 30632986800. Its totient is φ = 14017139136.

The previous prime is 21116525191. The next prime is 21116525233. The reversal of 21116525211 is 11252561112.

It is a happy number.

21116525211 is a `hidden beast` number, since 2 + 1 + 1 + 1 + 652 + 5 + 2 + 1 + 1 = 666.

It is not a de Polignac number, because 21116525211 - 2²¹ = 21114428059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21116025211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6352996 + ... + 6356318.

It is an arithmetic number, because the mean of its divisors is an integer number (1276374450).

Almost surely, 2^21116525211 is an apocalyptic number.

21116525211 is a deficient number, since it is larger than the sum of its proper divisors (9516461589).

21116525211 is a wasteful number, since it uses less digits than its factorization.

21116525211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6155 (or 6152 counting only the distinct ones).

The product of its digits is 1200, while the sum is 27.

The spelling of 21116525211 in words is "twenty-one billion, one hundred sixteen million, five hundred twenty-five thousand, two hundred eleven".