21166104 has 32 divisors (see below), whose sum is σ = 53709120. Its totient is φ = 6949536.

The previous prime is 21166099. The next prime is 21166111. The reversal of 21166104 is 40166112.

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, 4974 + ... + 8189.

It is an arithmetic number, because the mean of its divisors is an integer number (1678410).

Almost surely, 2^21166104 is an apocalyptic number.

21166104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21166104 is an abundant number, since it is smaller than the sum of its proper divisors (32543016).

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

21166104 is a wasteful number, since it uses less digits than its factorization.

21166104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13239 (or 13235 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 21166104 is about 4600.6634304196. The cubic root of 21166104 is about 276.6179182187.

The spelling of 21166104 in words is "twenty-one million, one hundred sixty-six thousand, one hundred four".