21200814 has 24 divisors (see below), whose sum is σ = 46020312. Its totient is φ = 7053840.

The previous prime is 21200801. The next prime is 21200821. The reversal of 21200814 is 41800212.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16872 + ... + 18084.

It is an arithmetic number, because the mean of its divisors is an integer number (1917513).

Almost surely, 2^21200814 is an apocalyptic number.

21200814 is an abundant number, since it is smaller than the sum of its proper divisors (24819498).

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

21200814 is a wasteful number, since it uses less digits than its factorization.

21200814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2192 (or 2189 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 21200814 is about 4604.4341671914. The cubic root of 21200814 is about 276.7690429338.

The spelling of 21200814 in words is "twenty-one million, two hundred thousand, eight hundred fourteen".