21084292 has 12 divisors (see below), whose sum is σ = 36984640. Its totient is φ = 10517256.

The previous prime is 21084289. The next prime is 21084311. The reversal of 21084292 is 29248012.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21084292.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4248 + ... + 7759.

Almost surely, 2^21084292 is an apocalyptic number.

It is an amenable number.

21084292 is a deficient number, since it is larger than the sum of its proper divisors (15900348).

21084292 is a wasteful number, since it uses less digits than its factorization.

21084292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12450 (or 12448 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 21084292 is about 4591.7634956518. The cubic root of 21084292 is about 276.2610601415.

It can be divided in two parts, 2108429 and 2, that added together give a triangular number (2108431 = T₂₀₅₃).

The spelling of 21084292 in words is "twenty-one million, eighty-four thousand, two hundred ninety-two".