11231021231 has 4 divisors (see below), whose sum is σ = 11271566712. Its totient is φ = 11190475752.

The previous prime is 11231021173. The next prime is 11231021237. The reversal of 11231021231 is 13212013211.

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 11231021231 - 2¹⁴ = 11231004847 is a prime.

It is a super-2 number, since 2×11231021231² (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 (11231021237) 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, 20272325 + ... + 20272878.

It is an arithmetic number, because the mean of its divisors is an integer number (2817891678).

Almost surely, 2^11231021231 is an apocalyptic number.

11231021231 is a deficient number, since it is larger than the sum of its proper divisors (40545481).

11231021231 is an equidigital number, since it uses as much as digits as its factorization.

11231021231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40545480.

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

Adding to 11231021231 its reverse (13212013211), we get a palindrome (24443034442).

The spelling of 11231021231 in words is "eleven billion, two hundred thirty-one million, twenty-one thousand, two hundred thirty-one".