121200042431 has 4 divisors (see below), whose sum is σ = 130523122632. Its totient is φ = 111876962232.

The previous prime is 121200042331. The next prime is 121200042463. The reversal of 121200042431 is 134240002121.

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 121200042431 - 2¹⁰ = 121200041407 is a prime.

It is a super-2 number, since 2×121200042431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121200042031) 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, 4661540081 + ... + 4661540106.

It is an arithmetic number, because the mean of its divisors is an integer number (32630780658).

Almost surely, 2^121200042431 is an apocalyptic number.

121200042431 is a deficient number, since it is larger than the sum of its proper divisors (9323080201).

121200042431 is an equidigital number, since it uses as much as digits as its factorization.

121200042431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9323080200.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 121200042431 its reverse (134240002121), we get a palindrome (255440044552).

The spelling of 121200042431 in words is "one hundred twenty-one billion, two hundred million, forty-two thousand, four hundred thirty-one".