21092418 has 12 divisors (see below), whose sum is σ = 45700278. Its totient is φ = 7030800.

The previous prime is 21092411. The next prime is 21092419. The reversal of 21092418 is 81429012.

It can be written as a sum of positive squares in only one way, i.e., 20277009 + 815409 = 4503^2 + 903^2 .

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21092391 and 21092400.

It is not an unprimeable number, because it can be changed into a prime (21092411) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 585883 + ... + 585918.

Almost surely, 2^21092418 is an apocalyptic number.

21092418 is an abundant number, since it is smaller than the sum of its proper divisors (24607860).

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

21092418 is a wasteful number, since it uses less digits than its factorization.

21092418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1171809 (or 1171806 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 21092418 is about 4592.6482556364. The cubic root of 21092418 is about 276.2965464179.

The spelling of 21092418 in words is "twenty-one million, ninety-two thousand, four hundred eighteen".