121203431 has 2 divisors, whose sum is σ = 121203432. Its totient is φ = 121203430.

The previous prime is 121203419. The next prime is 121203437. The reversal of 121203431 is 134302121.

It is a strong prime.

It is an emirp because it is prime and its reverse (134302121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121203431 - 2⁶ = 121203367 is a prime.

It is a super-2 number, since 2×121203431² = 29380543372343522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121203437) 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 as a sum of consecutive naturals, namely, 60601715 + 60601716.

It is an arithmetic number, because the mean of its divisors is an integer number (60601716).

Almost surely, 2^121203431 is an apocalyptic number.

121203431 is a deficient number, since it is larger than the sum of its proper divisors (1).

121203431 is an equidigital number, since it uses as much as digits as its factorization.

121203431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 121203431 is about 11009.2429803325. The cubic root of 121203431 is about 494.8857757731.

Adding to 121203431 its reverse (134302121), we get a palindrome (255505552).

It can be divided in two parts, 12120 and 3431, that added together give a palindrome (15551).

The spelling of 121203431 in words is "one hundred twenty-one million, two hundred three thousand, four hundred thirty-one".