11221213231 has 4 divisors (see below), whose sum is σ = 11221427952. Its totient is φ = 11220998512.

The previous prime is 11221213229. The next prime is 11221213243. The reversal of 11221213231 is 13231212211.

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 11221213231 - 2¹ = 11221213229 is a prime.

It is a super-2 number, since 2×11221213231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11221213199 and 11221213208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221213831) 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, 27486 + ... + 152308.

It is an arithmetic number, because the mean of its divisors is an integer number (2805356988).

Almost surely, 2^11221213231 is an apocalyptic number.

11221213231 is a deficient number, since it is larger than the sum of its proper divisors (214721).

11221213231 is an equidigital number, since it uses as much as digits as its factorization.

11221213231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214720.

The product of its digits is 144, while the sum is 19.

Adding to 11221213231 its reverse (13231212211), we get a palindrome (24452425442).

The spelling of 11221213231 in words is "eleven billion, two hundred twenty-one million, two hundred thirteen thousand, two hundred thirty-one".