21012698 has 16 divisors (see below), whose sum is σ = 36702720. Its totient is φ = 8835216.

The previous prime is 21012683. The next prime is 21012701. The reversal of 21012698 is 89621012.

It is a self number, because there is not a number n which added to its sum of digits gives 21012698.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13418 + ... + 14901.

It is an arithmetic number, because the mean of its divisors is an integer number (2293920).

Almost surely, 2^21012698 is an apocalyptic number.

21012698 is a deficient number, since it is larger than the sum of its proper divisors (15690022).

21012698 is a wasteful number, since it uses less digits than its factorization.

21012698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28381.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 21012698 is about 4583.9609509681. The cubic root of 21012698 is about 275.9480140834.

The spelling of 21012698 in words is "twenty-one million, twelve thousand, six hundred ninety-eight".