21793850 has 24 divisors (see below), whose sum is σ = 43656060. Its totient is φ = 8046720.

The previous prime is 21793843. The next prime is 21793859. The reversal of 21793850 is 5839712.

It can be written as a sum of positive squares in 6 ways, for example, as 5139289 + 16654561 = 2267^2 + 4081^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21793850.

It is not an unprimeable number, because it can be changed into a prime (21793859) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 16115 + ... + 17414.

Almost surely, 2^21793850 is an apocalyptic number.

21793850 is an abundant number, since it is smaller than the sum of its proper divisors (21862210).

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

21793850 is a wasteful number, since it uses less digits than its factorization.

21793850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33554 (or 33549 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 21793850 is about 4668.3883728756. The cubic root of 21793850 is about 279.3259722917.

The spelling of 21793850 in words is "twenty-one million, seven hundred ninety-three thousand, eight hundred fifty".