21130092 has 48 divisors (see below), whose sum is σ = 55373920. Its totient is φ = 6967296.

The previous prime is 21130079. The next prime is 21130111. The reversal of 21130092 is 29003112.

It is a happy number.

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9468 + ... + 11484.

Almost surely, 2^21130092 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 21130092, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27686960).

21130092 is an abundant number, since it is smaller than the sum of its proper divisors (34243828).

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

21130092 is a wasteful number, since it uses less digits than its factorization.

21130092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2127 (or 2119 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 21130092 is about 4596.7479809100. The cubic root of 21130092 is about 276.4609499618.

It can be divided in two parts, 211 and 30092, that added together give a palindrome (30303).

The spelling of 21130092 in words is "twenty-one million, one hundred thirty thousand, ninety-two".