21331230233 has 16 divisors (see below), whose sum is σ = 22704024960. Its totient is φ = 19971705600.

The previous prime is 21331230197. The next prime is 21331230247. The reversal of 21331230233 is 33203213312.

It is a cyclic number.

It is not a de Polignac number, because 21331230233 - 2²² = 21327035929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21331230199 and 21331230208.

It is not an unprimeable number, because it can be changed into a prime (21331230253) 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, 8995538 + ... + 8997908.

It is an arithmetic number, because the mean of its divisors is an integer number (1419001560).

Almost surely, 2^21331230233 is an apocalyptic number.

It is an amenable number.

21331230233 is a deficient number, since it is larger than the sum of its proper divisors (1372794727).

21331230233 is a wasteful number, since it uses less digits than its factorization.

21331230233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4928.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 21331230233 its reverse (33203213312), we get a palindrome (54534443545).

The spelling of 21331230233 in words is "twenty-one billion, three hundred thirty-one million, two hundred thirty thousand, two hundred thirty-three".