21163492 has 36 divisors (see below), whose sum is σ = 45358320. Its totient is φ = 8591184.

The previous prime is 21163481. The next prime is 21163507. The reversal of 21163492 is 29436112.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 21163492.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 883 + ... + 6565.

Almost surely, 2^21163492 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21163492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22679160).

21163492 is an abundant number, since it is smaller than the sum of its proper divisors (24194828).

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

21163492 is a wasteful number, since it uses less digits than its factorization.

21163492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5720 (or 5711 counting only the distinct ones).

The product of its digits is 2592, while the sum is 28.

The square root of 21163492 is about 4600.3795495589. The cubic root of 21163492 is about 276.6065390859.

The spelling of 21163492 in words is "twenty-one million, one hundred sixty-three thousand, four hundred ninety-two".