21166170 has 32 divisors (see below), whose sum is σ = 50922432. Its totient is φ = 5630592.

The previous prime is 21166163. The next prime is 21166177. The reversal of 21166170 is 7166112.

It is an interprime number because it is at equal distance from previous prime (21166163) and next prime (21166177).

It is a self number, because there is not a number n which added to its sum of digits gives 21166170.

It is not an unprimeable number, because it can be changed into a prime (21166177) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19974 + ... + 21006.

It is an arithmetic number, because the mean of its divisors is an integer number (1591326).

Almost surely, 2^21166170 is an apocalyptic number.

21166170 is an abundant number, since it is smaller than the sum of its proper divisors (29756262).

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

21166170 is a wasteful number, since it uses less digits than its factorization.

21166170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1726.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 21166170 is about 4600.6706032925. The cubic root of 21166170 is about 276.6182057344.

The spelling of 21166170 in words is "twenty-one million, one hundred sixty-six thousand, one hundred seventy".