13221020231 has 4 divisors (see below), whose sum is σ = 13221312312. Its totient is φ = 13220728152.

The previous prime is 13221020177. The next prime is 13221020233. The reversal of 13221020231 is 13202012231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13221020231 - 2²⁶ = 13153911367 is a prime.

It is a super-2 number, since 2×13221020231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221020233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62036 + ... + 174041.

It is an arithmetic number, because the mean of its divisors is an integer number (3305328078).

Almost surely, 2^13221020231 is an apocalyptic number.

13221020231 is a deficient number, since it is larger than the sum of its proper divisors (292081).

13221020231 is an equidigital number, since it uses as much as digits as its factorization.

13221020231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292080.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 13221020231 its reverse (13202012231), we get a palindrome (26423032462).

The spelling of 13221020231 in words is "thirteen billion, two hundred twenty-one million, twenty thousand, two hundred thirty-one".