21166552107 has 24 divisors (see below), whose sum is σ = 30808028160. Its totient is φ = 14003262000.

The previous prime is 21166552061. The next prime is 21166552133. The reversal of 21166552107 is 70125566112.

It is not a de Polignac number, because 21166552107 - 2⁷ = 21166551979 is a prime.

It is a super-2 number, since 2×21166552107² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21166552207) 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, 918982 + ... + 941732.

It is an arithmetic number, because the mean of its divisors is an integer number (1283667840).

Almost surely, 2^21166552107 is an apocalyptic number.

21166552107 is a deficient number, since it is larger than the sum of its proper divisors (9641476053).

21166552107 is a wasteful number, since it uses less digits than its factorization.

21166552107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23543 (or 23540 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The spelling of 21166552107 in words is "twenty-one billion, one hundred sixty-six million, five hundred fifty-two thousand, one hundred seven".