21333030 has 32 divisors (see below), whose sum is σ = 52169184. Its totient is φ = 5581056.

The previous prime is 21333023. The next prime is 21333047. The reversal of 21333030 is 3033312.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5119 + ... + 8298.

It is an arithmetic number, because the mean of its divisors is an integer number (1630287).

Almost surely, 2^21333030 is an apocalyptic number.

21333030 is an abundant number, since it is smaller than the sum of its proper divisors (30836154).

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

21333030 is a wasteful number, since it uses less digits than its factorization.

21333030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13480.

The product of its (nonzero) digits is 162, while the sum is 15.

The square root of 21333030 is about 4618.7693166037. The cubic root of 21333030 is about 277.3431952366.

Adding to 21333030 its reverse (3033312), we get a palindrome (24366342).

The spelling of 21333030 in words is "twenty-one million, three hundred thirty-three thousand, thirty".