21026994 has 32 divisors (see below), whose sum is σ = 44784576. Its totient is φ = 6558720.

The previous prime is 21026987. The next prime is 21027007. The reversal of 21026994 is 49962012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21034 + ... + 22010.

It is an arithmetic number, because the mean of its divisors is an integer number (1399518).

Almost surely, 2^21026994 is an apocalyptic number.

21026994 is an abundant number, since it is smaller than the sum of its proper divisors (23757582).

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

21026994 is a wasteful number, since it uses less digits than its factorization.

21026994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1210.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 21026994 is about 4585.5200359392. The cubic root of 21026994 is about 276.0105803547.

The spelling of 21026994 in words is "twenty-one million, twenty-six thousand, nine hundred ninety-four".