21200394 has 16 divisors (see below), whose sum is σ = 44895168. Its totient is φ = 6651072.

The previous prime is 21200383. The next prime is 21200401. The reversal of 21200394 is 49300212.

It is a self number, because there is not a number n which added to its sum of digits gives 21200394.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103822 + ... + 104025.

It is an arithmetic number, because the mean of its divisors is an integer number (2805948).

Almost surely, 2^21200394 is an apocalyptic number.

21200394 is an abundant number, since it is smaller than the sum of its proper divisors (23694774).

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

21200394 is a wasteful number, since it uses less digits than its factorization.

21200394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207869.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 21200394 is about 4604.3885587557. The cubic root of 21200394 is about 276.7672152718.

The spelling of 21200394 in words is "twenty-one million, two hundred thousand, three hundred ninety-four".