21333201233021 has 4 divisors (see below), whose sum is σ = 21346427025852. Its totient is φ = 21319975440192.

The previous prime is 21333201232999. The next prime is 21333201233053. The reversal of 21333201233021 is 12033210233312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11996448760921 + 9336752472100 = 3463589^2 + 3055610^2 .

It is a cyclic number.

It is not a de Polignac number, because 21333201233021 - 2²⁶ = 21333134124157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21333201236021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6612893996 + ... + 6612897221.

It is an arithmetic number, because the mean of its divisors is an integer number (5336606756463).

Almost surely, 2^{21333201233021} is an apocalyptic number.

It is an amenable number.

21333201233021 is a deficient number, since it is larger than the sum of its proper divisors (13225792831).

21333201233021 is a wasteful number, since it uses less digits than its factorization.

21333201233021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13225792830.

The product of its (nonzero) digits is 3888, while the sum is 26.

Adding to 21333201233021 its reverse (12033210233312), we get a palindrome (33366411466333).

The spelling of 21333201233021 in words is "twenty-one trillion, three hundred thirty-three billion, two hundred one million, two hundred thirty-three thousand, twenty-one".