21050790 has 32 divisors (see below), whose sum is σ = 51238656. Its totient is φ = 5533920.

The previous prime is 21050749. The next prime is 21050801. The reversal of 21050790 is 9705012.

It is a self number, because there is not a number n which added to its sum of digits gives 21050790.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2812 + ... + 7071.

It is an arithmetic number, because the mean of its divisors is an integer number (1601208).

Almost surely, 2^21050790 is an apocalyptic number.

21050790 is an abundant number, since it is smaller than the sum of its proper divisors (30187866).

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

21050790 is a wasteful number, since it uses less digits than its factorization.

21050790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9964.

The product of its (nonzero) digits is 630, while the sum is 24.

The square root of 21050790 is about 4588.1139916092. The cubic root of 21050790 is about 276.1146604038.

The spelling of 21050790 in words is "twenty-one million, fifty thousand, seven hundred ninety".