21333400 has 48 divisors (see below), whose sum is σ = 54114840. Its totient is φ = 7756800.

The previous prime is 21333353. The next prime is 21333413. The reversal of 21333400 is 433312.

It is a super-2 number, since 2×21333400² = 910227911120000, which contains 22 as substring.

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, 2649 + ... + 7048.

Almost surely, 2^21333400 is an apocalyptic number.

21333400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21333400 is an abundant number, since it is smaller than the sum of its proper divisors (32781440).

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

21333400 is a wasteful number, since it uses less digits than its factorization.

21333400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9724 (or 9715 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 21333400 is about 4618.8093703897. The cubic root of 21333400 is about 277.3447986405.

Adding to 21333400 its reverse (433312), we get a palindrome (21766712).

The spelling of 21333400 in words is "twenty-one million, three hundred thirty-three thousand, four hundred".