21201312333 has 12 divisors (see below), whose sum is σ = 28811857760. Its totient is φ = 13867519536.

The previous prime is 21201312311. The next prime is 21201312361. The reversal of 21201312333 is 33321310212.

It is not a de Polignac number, because 21201312333 - 2¹⁴ = 21201295949 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 (21201312133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1249513 + ... + 1266366.

Almost surely, 2^21201312333 is an apocalyptic number.

It is an amenable number.

21201312333 is a deficient number, since it is larger than the sum of its proper divisors (7610545427).

21201312333 is an equidigital number, since it uses as much as digits as its factorization.

21201312333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2515988 (or 2515935 counting only the distinct ones).

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

Adding to 21201312333 its reverse (33321310212), we get a palindrome (54522622545).

The spelling of 21201312333 in words is "twenty-one billion, two hundred one million, three hundred twelve thousand, three hundred thirty-three".