21333303121 has 4 divisors (see below), whose sum is σ = 22974326452. Its totient is φ = 19692279792.

The previous prime is 21333303049. The next prime is 21333303127. The reversal of 21333303121 is 12130333312.

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 10876195521 + 10457107600 = 104289^2 + 102260^2 .

It is a cyclic number.

It is not a de Polignac number, because 21333303121 - 2²⁷ = 21199085393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21333303092 and 21333303101.

It is not an unprimeable number, because it can be changed into a prime (21333303127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 820511646 + ... + 820511671.

It is an arithmetic number, because the mean of its divisors is an integer number (5743581613).

Almost surely, 2^21333303121 is an apocalyptic number.

It is an amenable number.

21333303121 is a deficient number, since it is larger than the sum of its proper divisors (1641023331).

21333303121 is a wasteful number, since it uses less digits than its factorization.

21333303121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1641023330.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 21333303121 its reverse (12130333312), we get a palindrome (33463636433).

The spelling of 21333303121 in words is "twenty-one billion, three hundred thirty-three million, three hundred three thousand, one hundred twenty-one".