21159190 has 64 divisors (see below), whose sum is σ = 43436736. Its totient is φ = 7368192.

The previous prime is 21159181. The next prime is 21159211. The reversal of 21159190 is 9195112.

It is a super-2 number, since 2×21159190² = 895422642912200, which contains 22 as substring.

It is a congruent number.

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, 254889 + ... + 254971.

It is an arithmetic number, because the mean of its divisors is an integer number (678699).

Almost surely, 2^21159190 is an apocalyptic number.

21159190 is an abundant number, since it is smaller than the sum of its proper divisors (22277546).

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

21159190 is a wasteful number, since it uses less digits than its factorization.

21159190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193.

The product of its (nonzero) digits is 810, while the sum is 28.

The square root of 21159190 is about 4599.9119556792. The cubic root of 21159190 is about 276.5877954562.

Adding to 21159190 its product of nonzero digits (810), we get a square (21160000 = 4600²).

The spelling of 21159190 in words is "twenty-one million, one hundred fifty-nine thousand, one hundred ninety".