21333966 has 16 divisors (see below), whose sum is σ = 44139600. Its totient is φ = 6866048.

The previous prime is 21333947. The next prime is 21333967. The reversal of 21333966 is 66933312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21333967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61131 + ... + 61478.

It is an arithmetic number, because the mean of its divisors is an integer number (2758725).

Almost surely, 2^21333966 is an apocalyptic number.

21333966 is an abundant number, since it is smaller than the sum of its proper divisors (22805634).

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

21333966 is a wasteful number, since it uses less digits than its factorization.

21333966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122643.

The product of its digits is 17496, while the sum is 33.

The square root of 21333966 is about 4618.8706411849. The cubic root of 21333966 is about 277.3472513792.

The spelling of 21333966 in words is "twenty-one million, three hundred thirty-three thousand, nine hundred sixty-six".