21223300 has 36 divisors (see below), whose sum is σ = 52635520. Its totient is φ = 7276320.

The previous prime is 21223297. The next prime is 21223333. The reversal of 21223300 is 332212.

It is a happy 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, 14460 + ... + 15859.

Almost surely, 2^21223300 is an apocalyptic number.

21223300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21223300 is an abundant number, since it is smaller than the sum of its proper divisors (31412220).

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

21223300 is a wasteful number, since it uses less digits than its factorization.

21223300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30340 (or 30333 counting only the distinct ones).

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

The square root of 21223300 is about 4606.8752967711. The cubic root of 21223300 is about 276.8668572562.

Adding to 21223300 its reverse (332212), we get a palindrome (21555512).

The spelling of 21223300 in words is "twenty-one million, two hundred twenty-three thousand, three hundred".