21130998 has 32 divisors (see below), whose sum is σ = 48508416. Its totient is φ = 6011328.

The previous prime is 21130987. The next prime is 21131009. The reversal of 21130998 is 89903112.

It is an interprime number because it is at equal distance from previous prime (21130987) and next prime (21131009).

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, 10090 + ... + 12002.

It is an arithmetic number, because the mean of its divisors is an integer number (1515888).

Almost surely, 2^21130998 is an apocalyptic number.

21130998 is an abundant number, since it is smaller than the sum of its proper divisors (27377418).

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

21130998 is a wasteful number, since it uses less digits than its factorization.

21130998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2188.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 21130998 is about 4596.8465277840. The cubic root of 21130998 is about 276.4649011994.

The spelling of 21130998 in words is "twenty-one million, one hundred thirty thousand, nine hundred ninety-eight".