21802612 has 12 divisors (see below), whose sum is σ = 41089636. Its totient is φ = 10062720.

The previous prime is 21802607. The next prime is 21802621. The reversal of 21802612 is 21620812.

It can be written as a sum of positive squares in 2 ways, for example, as 7695076 + 14107536 = 2774^2 + 3756^2 .

It is a congruent number.

It is an unprimeable number.

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, 209589 + ... + 209692.

Almost surely, 2^21802612 is an apocalyptic number.

It is an amenable number.

21802612 is a deficient number, since it is larger than the sum of its proper divisors (19287024).

21802612 is a wasteful number, since it uses less digits than its factorization.

21802612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419298 (or 419296 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 21802612 is about 4669.3267180612. The cubic root of 21802612 is about 279.3634006832.

The spelling of 21802612 in words is "twenty-one million, eight hundred two thousand, six hundred twelve".