21231313233 has 16 divisors (see below), whose sum is σ = 30519503616. Its totient is φ = 13051059840.

The previous prime is 21231313231. The next prime is 21231313297. The reversal of 21231313233 is 33231313212.

It is not a de Polignac number, because 21231313233 - 2¹ = 21231313231 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21231313231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 263260 + ... + 334317.

It is an arithmetic number, because the mean of its divisors is an integer number (1907468976).

Almost surely, 2^21231313233 is an apocalyptic number.

It is an amenable number.

21231313233 is a deficient number, since it is larger than the sum of its proper divisors (9288190383).

21231313233 is a wasteful number, since it uses less digits than its factorization.

21231313233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598504.

The product of its digits is 1944, while the sum is 24.

Adding to 21231313233 its reverse (33231313212), we get a palindrome (54462626445).

The spelling of 21231313233 in words is "twenty-one billion, two hundred thirty-one million, three hundred thirteen thousand, two hundred thirty-three".