21322300 has 18 divisors (see below), whose sum is σ = 46269608. Its totient is φ = 8528880.

The previous prime is 21322297. The next prime is 21322307. The reversal of 21322300 is 322312.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21322307) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 106512 + ... + 106711.

Almost surely, 2^21322300 is an apocalyptic number.

21322300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21322300 is an abundant number, since it is smaller than the sum of its proper divisors (24947308).

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

21322300 is a wasteful number, since it uses less digits than its factorization.

21322300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213237 (or 213230 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 21322300 is about 4617.6076056763. The cubic root of 21322300 is about 277.2966884572.

Adding to 21322300 its reverse (322312), we get a palindrome (21644612).

The spelling of 21322300 in words is "twenty-one million, three hundred twenty-two thousand, three hundred".