21162290 has 16 divisors (see below), whose sum is σ = 38328768. Its totient is φ = 8412336.

The previous prime is 21162289. The next prime is 21162307. The reversal of 21162290 is 9226112.

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 7 ways as a sum of consecutive naturals, for example, 4862 + ... + 8121.

It is an arithmetic number, because the mean of its divisors is an integer number (2395548).

Almost surely, 2^21162290 is an apocalyptic number.

21162290 is a deficient number, since it is larger than the sum of its proper divisors (17166478).

21162290 is a wasteful number, since it uses less digits than its factorization.

21162290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13153.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 21162290 is about 4600.2489063093. The cubic root of 21162290 is about 276.6013022791.

The spelling of 21162290 in words is "twenty-one million, one hundred sixty-two thousand, two hundred ninety".