121142431 has 4 divisors (see below), whose sum is σ = 121165632. Its totient is φ = 121119232.

The previous prime is 121142419. The next prime is 121142443. The reversal of 121142431 is 134241121.

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

It is an interprime number because it is at equal distance from previous prime (121142419) and next prime (121142443).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121142431 is a prime.

It is a super-3 number, since 3×121142431³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121142399 and 121142408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121143431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 306 + ... + 15568.

It is an arithmetic number, because the mean of its divisors is an integer number (30291408).

Almost surely, 2^121142431 is an apocalyptic number.

121142431 is a deficient number, since it is larger than the sum of its proper divisors (23201).

121142431 is an equidigital number, since it uses as much as digits as its factorization.

121142431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23200.

The product of its digits is 192, while the sum is 19.

The square root of 121142431 is about 11006.4722322822. The cubic root of 121142431 is about 494.8027388000.

Adding to 121142431 its reverse (134241121), we get a palindrome (255383552).

The spelling of 121142431 in words is "one hundred twenty-one million, one hundred forty-two thousand, four hundred thirty-one".