121224042131 has 4 divisors (see below), whose sum is σ = 124500367632. Its totient is φ = 117947716632.

The previous prime is 121224042127. The next prime is 121224042143. The reversal of 121224042131 is 131240422121.

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 121224042131 - 2² = 121224042127 is a prime.

It is a super-2 number, since 2×121224042131² (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 = 121224042097 and 121224042106.

It is not an unprimeable number, because it can be changed into a prime (121224042031) 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, 1638162695 + ... + 1638162768.

It is an arithmetic number, because the mean of its divisors is an integer number (31125091908).

Almost surely, 2^121224042131 is an apocalyptic number.

121224042131 is a deficient number, since it is larger than the sum of its proper divisors (3276325501).

121224042131 is an equidigital number, since it uses as much as digits as its factorization.

121224042131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3276325500.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 121224042131 its reverse (131240422121), we get a palindrome (252464464252).

The spelling of 121224042131 in words is "one hundred twenty-one billion, two hundred twenty-four million, forty-two thousand, one hundred thirty-one".