11101221231 has 4 divisors (see below), whose sum is σ = 14801628312. Its totient is φ = 7400814152.

The previous prime is 11101221227. The next prime is 11101221277. The reversal of 11101221231 is 13212210111.

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 11101221231 - 2² = 11101221227 is a prime.

It is a super-2 number, since 2×11101221231² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11101221231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11101231231) 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, 1850203536 + ... + 1850203541.

It is an arithmetic number, because the mean of its divisors is an integer number (3700407078).

Almost surely, 2^11101221231 is an apocalyptic number.

11101221231 is a deficient number, since it is larger than the sum of its proper divisors (3700407081).

11101221231 is an equidigital number, since it uses as much as digits as its factorization.

11101221231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3700407080.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 11101221231 its reverse (13212210111), we get a palindrome (24313431342).

The spelling of 11101221231 in words is "eleven billion, one hundred one million, two hundred twenty-one thousand, two hundred thirty-one".