21490658 has 16 divisors (see below), whose sum is σ = 37181760. Its totient is φ = 9125136.

The previous prime is 21490643. The next prime is 21490663. The reversal of 21490658 is 85609412.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 5516 + ... + 8567.

It is an arithmetic number, because the mean of its divisors is an integer number (2323860).

Almost surely, 2^21490658 is an apocalyptic number.

21490658 is a deficient number, since it is larger than the sum of its proper divisors (15691102).

21490658 is a wasteful number, since it uses less digits than its factorization.

21490658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14201.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 21490658 is about 4635.8017645279. The cubic root of 21490658 is about 278.0246083490.

The spelling of 21490658 in words is "twenty-one million, four hundred ninety thousand, six hundred fifty-eight".