21164130 has 48 divisors (see below), whose sum is σ = 59262840. Its totient is φ = 5209344.

The previous prime is 21164107. The next prime is 21164141. The reversal of 21164130 is 3146112.

It is a happy number.

21164130 is a `hidden beast` number, since 21 + 1 + 641 + 3 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 17715681 + 3448449 = 4209^2 + 1857^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7875 + ... + 10214.

Almost surely, 2^21164130 is an apocalyptic number.

21164130 is an abundant number, since it is smaller than the sum of its proper divisors (38098710).

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

21164130 is a wasteful number, since it uses less digits than its factorization.

21164130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18115 (or 18112 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 21164130 is about 4600.4488911410. The cubic root of 21164130 is about 276.6093186083.

The spelling of 21164130 in words is "twenty-one million, one hundred sixty-four thousand, one hundred thirty".