21333120231 has 32 divisors (see below), whose sum is σ = 29119104000. Its totient is φ = 13888206720.

The previous prime is 21333120227. The next prime is 21333120247. The reversal of 21333120231 is 13202133312.

It is not a de Polignac number, because 21333120231 - 2² = 21333120227 is a prime.

It is a super-2 number, since 2×21333120231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21333120198 and 21333120207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21333120251) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22670221 + ... + 22671161.

It is an arithmetic number, because the mean of its divisors is an integer number (909972000).

Almost surely, 2^21333120231 is an apocalyptic number.

21333120231 is a deficient number, since it is larger than the sum of its proper divisors (7785983769).

21333120231 is a wasteful number, since it uses less digits than its factorization.

21333120231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1719.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21333120231 its reverse (13202133312), we get a palindrome (34535253543).

The spelling of 21333120231 in words is "twenty-one billion, three hundred thirty-three million, one hundred twenty thousand, two hundred thirty-one".