13331220231 has 12 divisors (see below), whose sum is σ = 20676994872. Its totient is φ = 7617840048.

The previous prime is 13331220223. The next prime is 13331220251. The reversal of 13331220231 is 13202213331.

It is not a de Polignac number, because 13331220231 - 2³ = 13331220223 is a prime.

It is a super-2 number, since 2×13331220231² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 13331220198 and 13331220207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13331220251) 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, 45344140 + ... + 45344433.

It is an arithmetic number, because the mean of its divisors is an integer number (1723082906).

Almost surely, 2^13331220231 is an apocalyptic number.

13331220231 is a deficient number, since it is larger than the sum of its proper divisors (7345774641).

13331220231 is an equidigital number, since it uses as much as digits as its factorization.

13331220231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90688590 (or 90688583 counting only the distinct ones).

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

Adding to 13331220231 its reverse (13202213331), we get a palindrome (26533433562).

The spelling of 13331220231 in words is "thirteen billion, three hundred thirty-one million, two hundred twenty thousand, two hundred thirty-one".