21164310 has 24 divisors (see below), whose sum is σ = 55027440. Its totient is φ = 5643792.

The previous prime is 21164293. The next prime is 21164321. The reversal of 21164310 is 1346112.

It is a happy number.

21164310 is a `hidden beast` number, since 2 + 11 + 643 + 10 = 666.

It is a super-2 number, since 2×21164310² = 895856035552200, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 117490 + ... + 117669.

It is an arithmetic number, because the mean of its divisors is an integer number (2292810).

Almost surely, 2^21164310 is an apocalyptic number.

21164310 is an abundant number, since it is smaller than the sum of its proper divisors (33863130).

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

21164310 is a wasteful number, since it uses less digits than its factorization.

21164310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235172 (or 235169 counting only the distinct ones).

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

The square root of 21164310 is about 4600.4684544077. The cubic root of 21164310 is about 276.6101027894.

The spelling of 21164310 in words is "twenty-one million, one hundred sixty-four thousand, three hundred ten".