21800774 has 8 divisors (see below), whose sum is σ = 33018960. Its totient is φ = 10794456.

The previous prime is 21800759. The next prime is 21800777. The reversal of 21800774 is 47700812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21800777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52709 + ... + 53120.

It is an arithmetic number, because the mean of its divisors is an integer number (4127370).

Almost surely, 2^21800774 is an apocalyptic number.

21800774 is a deficient number, since it is larger than the sum of its proper divisors (11218186).

21800774 is a wasteful number, since it uses less digits than its factorization.

21800774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105934.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 21800774 is about 4669.1298975291. The cubic root of 21800774 is about 279.3555501810.

The spelling of 21800774 in words is "twenty-one million, eight hundred thousand, seven hundred seventy-four".