21430612 has 12 divisors (see below), whose sum is σ = 42861280. Its totient is φ = 9184536.

The previous prime is 21430597. The next prime is 21430621. The reversal of 21430612 is 21603412.

21430612 is an admirable number.

It is a super-2 number, since 2×21430612² = 918542261389088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21430612.

It is a congruent number.

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, 382662 + ... + 382717.

Almost surely, 2^21430612 is an apocalyptic number.

It is an amenable number.

21430612 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21430612 is a wasteful number, since it uses less digits than its factorization.

21430612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765390 (or 765388 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 21430612 is about 4629.3209005209. The cubic root of 21430612 is about 277.7654284762.

The spelling of 21430612 in words is "twenty-one million, four hundred thirty thousand, six hundred twelve".