121335431 has 4 divisors (see below), whose sum is σ = 138669072. Its totient is φ = 104001792.

The previous prime is 121335397. The next prime is 121335439. The reversal of 121335431 is 134533121.

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 121335431 - 2²² = 117141127 is a prime.

It is a super-2 number, since 2×121335431² = 29444573631911522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121335397 and 121335406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121335439) 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, 8666810 + ... + 8666823.

It is an arithmetic number, because the mean of its divisors is an integer number (34667268).

Almost surely, 2^121335431 is an apocalyptic number.

121335431 is a deficient number, since it is larger than the sum of its proper divisors (17333641).

121335431 is an equidigital number, since it uses as much as digits as its factorization.

121335431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17333640.

The product of its digits is 1080, while the sum is 23.

The square root of 121335431 is about 11015.2363115822. The cubic root of 121335431 is about 495.0653670095.

Adding to 121335431 its reverse (134533121), we get a palindrome (255868552).

The spelling of 121335431 in words is "one hundred twenty-one million, three hundred thirty-five thousand, four hundred thirty-one".