121320312231 has 4 divisors (see below), whose sum is σ = 161760416312. Its totient is φ = 80880208152.

The previous prime is 121320312221. The next prime is 121320312251. The reversal of 121320312231 is 132213023121.

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

It is not a de Polignac number, because 121320312231 - 2⁹ = 121320311719 is a prime.

It is a super-2 number, since 2×121320312231² (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 = 121320312198 and 121320312207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121320312221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20220052036 + ... + 20220052041.

It is an arithmetic number, because the mean of its divisors is an integer number (40440104078).

Almost surely, 2^121320312231 is an apocalyptic number.

121320312231 is a deficient number, since it is larger than the sum of its proper divisors (40440104081).

121320312231 is an equidigital number, since it uses as much as digits as its factorization.

121320312231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40440104080.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 121320312231 its reverse (132213023121), we get a palindrome (253533335352).

The spelling of 121320312231 in words is "one hundred twenty-one billion, three hundred twenty million, three hundred twelve thousand, two hundred thirty-one".