21213092 has 12 divisors (see below), whose sum is σ = 37407216. Its totient is φ = 10525320.

The previous prime is 21213089. The next prime is 21213097. The reversal of 21213092 is 29031212.

It is not an unprimeable number, because it can be changed into a prime (21213097) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 19718 + ... + 20765.

It is an arithmetic number, because the mean of its divisors is an integer number (3117268).

Almost surely, 2^21213092 is an apocalyptic number.

It is an amenable number.

21213092 is a deficient number, since it is larger than the sum of its proper divisors (16194124).

21213092 is a wasteful number, since it uses less digits than its factorization.

21213092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40618 (or 40616 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 21213092 is about 4605.7672542151. The cubic root of 21213092 is about 276.8224609225.

The spelling of 21213092 in words is "twenty-one million, two hundred thirteen thousand, ninety-two".