21030668 has 12 divisors (see below), whose sum is σ = 37427880. Its totient is φ = 10336992.

The previous prime is 21030637. The next prime is 21030677. The reversal of 21030668 is 86603012.

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, 44321 + ... + 44792.

It is an arithmetic number, because the mean of its divisors is an integer number (3118990).

Almost surely, 2^21030668 is an apocalyptic number.

It is an amenable number.

21030668 is a deficient number, since it is larger than the sum of its proper divisors (16397212).

21030668 is a wasteful number, since it uses less digits than its factorization.

21030668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89176 (or 89174 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 21030668 is about 4585.9206273114. The cubic root of 21030668 is about 276.0266549906.

The spelling of 21030668 in words is "twenty-one million, thirty thousand, six hundred sixty-eight".