21900322 has 16 divisors (see below), whose sum is σ = 34036992. Its totient is φ = 10557360.

The previous prime is 21900313. The next prime is 21900341. The reversal of 21900322 is 22300912.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21900322.

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, 22653 + ... + 23599.

It is an arithmetic number, because the mean of its divisors is an integer number (2127312).

Almost surely, 2^21900322 is an apocalyptic number.

21900322 is a deficient number, since it is larger than the sum of its proper divisors (12136670).

21900322 is a wasteful number, since it uses less digits than its factorization.

21900322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1353.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 21900322 is about 4679.7779861870. Note that the first 3 decimals coincide. The cubic root of 21900322 is about 279.7801079699.

It can be divided in two parts, 21900 and 322, that added together give a palindrome (22222).

The spelling of 21900322 in words is "twenty-one million, nine hundred thousand, three hundred twenty-two".