11022031231 has 4 divisors (see below), whose sum is σ = 11154826872. Its totient is φ = 10889235592.

The previous prime is 11022031219. The next prime is 11022031249. The reversal of 11022031231 is 13213022011.

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 11022031231 - 2¹⁷ = 11021900159 is a prime.

It is a super-2 number, since 2×11022031231² (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 (11022031331) 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, 66397696 + ... + 66397861.

It is an arithmetic number, because the mean of its divisors is an integer number (2788706718).

Almost surely, 2^11022031231 is an apocalyptic number.

11022031231 is a deficient number, since it is larger than the sum of its proper divisors (132795641).

11022031231 is an equidigital number, since it uses as much as digits as its factorization.

11022031231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132795640.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 11022031231 its reverse (13213022011), we get a palindrome (24235053242).

The spelling of 11022031231 in words is "eleven billion, twenty-two million, thirty-one thousand, two hundred thirty-one".