121355244031 has 4 divisors (see below), whose sum is σ = 138691707472. Its totient is φ = 104018780592.

The previous prime is 121355243993. The next prime is 121355244047. The reversal of 121355244031 is 130442553121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121355244031 is a prime.

It is a super-2 number, since 2×121355244031² (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 = 121355243984 and 121355244002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121355244061) 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, 8668231710 + ... + 8668231723.

It is an arithmetic number, because the mean of its divisors is an integer number (34672926868).

Almost surely, 2^121355244031 is an apocalyptic number.

121355244031 is a deficient number, since it is larger than the sum of its proper divisors (17336463441).

121355244031 is an equidigital number, since it uses as much as digits as its factorization.

121355244031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17336463440.

The product of its (nonzero) digits is 14400, while the sum is 31.

Adding to 121355244031 its reverse (130442553121), we get a palindrome (251797797152).

The spelling of 121355244031 in words is "one hundred twenty-one billion, three hundred fifty-five million, two hundred forty-four thousand, thirty-one".