21082612 has 6 divisors (see below), whose sum is σ = 36894578. Its totient is φ = 10541304.

The previous prime is 21082603. The next prime is 21082613. The reversal of 21082612 is 21628012.

It can be written as a sum of positive squares in only one way, i.e., 20848356 + 234256 = 4566^2 + 484^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21082613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2635323 + ... + 2635330.

Almost surely, 2^21082612 is an apocalyptic number.

It is an amenable number.

21082612 is a deficient number, since it is larger than the sum of its proper divisors (15811966).

21082612 is a wasteful number, since it uses less digits than its factorization.

21082612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5270657 (or 5270655 counting only the distinct ones).

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

The square root of 21082612 is about 4591.5805557564. The cubic root of 21082612 is about 276.2537224371.

The spelling of 21082612 in words is "twenty-one million, eighty-two thousand, six hundred twelve".