11120121231 has 4 divisors (see below), whose sum is σ = 14826828312. Its totient is φ = 7413414152.

The previous prime is 11120121223. The next prime is 11120121239. The reversal of 11120121231 is 13212102111.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (11120121223) and next prime (11120121239).

It is a cyclic number.

It is not a de Polignac number, because 11120121231 - 2³ = 11120121223 is a prime.

It is a super-2 number, since 2×11120121231² (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 11120121231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11120121239) 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, 1853353536 + ... + 1853353541.

It is an arithmetic number, because the mean of its divisors is an integer number (3706707078).

Almost surely, 2^11120121231 is an apocalyptic number.

11120121231 is a deficient number, since it is larger than the sum of its proper divisors (3706707081).

11120121231 is an equidigital number, since it uses as much as digits as its factorization.

11120121231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3706707080.

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

Adding to 11120121231 its reverse (13212102111), we get a palindrome (24332223342).

The spelling of 11120121231 in words is "eleven billion, one hundred twenty million, one hundred twenty-one thousand, two hundred thirty-one".