21164070 has 32 divisors (see below), whose sum is σ = 50950368. Its totient is φ = 5626368.

The previous prime is 21164063. The next prime is 21164093. The reversal of 21164070 is 7046112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11022 + ... + 12798.

It is an arithmetic number, because the mean of its divisors is an integer number (1592199).

Almost surely, 2^21164070 is an apocalyptic number.

21164070 is an abundant number, since it is smaller than the sum of its proper divisors (29786298).

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

21164070 is a wasteful number, since it uses less digits than its factorization.

21164070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2184.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 21164070 is about 4600.4423700336. The cubic root of 21164070 is about 276.6090572136.

The spelling of 21164070 in words is "twenty-one million, one hundred sixty-four thousand, seventy".