11221310231 has 4 divisors (see below), whose sum is σ = 11221552200. Its totient is φ = 11221068264.

The previous prime is 11221310203. The next prime is 11221310237. The reversal of 11221310231 is 13201312211.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11221310231 is a prime.

It is a super-2 number, since 2×11221310231² (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 (11221310237) 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, 27176 + ... + 152253.

It is an arithmetic number, because the mean of its divisors is an integer number (2805388050).

Almost surely, 2^11221310231 is an apocalyptic number.

11221310231 is a deficient number, since it is larger than the sum of its proper divisors (241969).

11221310231 is an equidigital number, since it uses as much as digits as its factorization.

11221310231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241968.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 11221310231 its reverse (13201312211), we get a palindrome (24422622442).

The spelling of 11221310231 in words is "eleven billion, two hundred twenty-one million, three hundred ten thousand, two hundred thirty-one".