21164010 has 64 divisors (see below), whose sum is σ = 59940864. Its totient is φ = 4680000.

The previous prime is 21163999. The next prime is 21164029. The reversal of 21164010 is 1046112.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4885 + ... + 8135.

It is an arithmetic number, because the mean of its divisors is an integer number (936576).

Almost surely, 2^21164010 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21164010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29970432).

21164010 is an abundant number, since it is smaller than the sum of its proper divisors (38776854).

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

21164010 is a wasteful number, since it uses less digits than its factorization.

21164010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3299.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 21164010 is about 4600.4358489169. The cubic root of 21164010 is about 276.6087958184.

The spelling of 21164010 in words is "twenty-one million, one hundred sixty-four thousand, ten".