121111323231 has 4 divisors (see below), whose sum is σ = 161481764312. Its totient is φ = 80740882152.

The previous prime is 121111323149. The next prime is 121111323241. The reversal of 121111323231 is 132323111121.

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

It is not a de Polignac number, because 121111323231 - 2¹⁹ = 121110798943 is a prime.

It is a super-2 number, since 2×121111323231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121111323198 and 121111323207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121111323241) 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, 20185220536 + ... + 20185220541.

It is an arithmetic number, because the mean of its divisors is an integer number (40370441078).

Almost surely, 2^121111323231 is an apocalyptic number.

121111323231 is a deficient number, since it is larger than the sum of its proper divisors (40370441081).

121111323231 is an equidigital number, since it uses as much as digits as its factorization.

121111323231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40370441080.

The product of its digits is 216, while the sum is 21.

Adding to 121111323231 its reverse (132323111121), we get a palindrome (253434434352).

The spelling of 121111323231 in words is "one hundred twenty-one billion, one hundred eleven million, three hundred twenty-three thousand, two hundred thirty-one".