11221013231 has 4 divisors (see below), whose sum is σ = 11222212464. Its totient is φ = 11219814000.

The previous prime is 11221013227. The next prime is 11221013233. The reversal of 11221013231 is 13231012211.

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 11221013231 - 2² = 11221013227 is a prime.

It is a super-2 number, since 2×11221013231² (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 (11221013233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 585470 + ... + 604331.

It is an arithmetic number, because the mean of its divisors is an integer number (2805553116).

Almost surely, 2^11221013231 is an apocalyptic number.

11221013231 is a deficient number, since it is larger than the sum of its proper divisors (1199233).

11221013231 is an equidigital number, since it uses as much as digits as its factorization.

11221013231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1199232.

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

Adding to 11221013231 its reverse (13231012211), we get a palindrome (24452025442).

The spelling of 11221013231 in words is "eleven billion, two hundred twenty-one million, thirteen thousand, two hundred thirty-one".