21113166 has 16 divisors (see below), whose sum is σ = 42357888. Its totient is φ = 7015800.

The previous prime is 21113159. The next prime is 21113173. The reversal of 21113166 is 66131112.

It is an interprime number because it is at equal distance from previous prime (21113159) and next prime (21113173).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3330 + ... + 7301.

It is an arithmetic number, because the mean of its divisors is an integer number (2647368).

Almost surely, 2^21113166 is an apocalyptic number.

21113166 is an abundant number, since it is smaller than the sum of its proper divisors (21244722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21113166 is a wasteful number, since it uses less digits than its factorization.

21113166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10967.

The product of its digits is 216, while the sum is 21.

The square root of 21113166 is about 4594.9065278850. The cubic root of 21113166 is about 276.3871116960.

Adding to 21113166 its reverse (66131112), we get a palindrome (87244278).

The spelling of 21113166 in words is "twenty-one million, one hundred thirteen thousand, one hundred sixty-six".