121323431 has 4 divisors (see below), whose sum is σ = 122436600. Its totient is φ = 120210264.

The previous prime is 121323409. The next prime is 121323473. The reversal of 121323431 is 134323121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134323121 = 3163 ⋅42467.

It is a cyclic number.

It is not a de Polignac number, because 121323431 - 2²² = 117129127 is a prime.

It is a super-2 number, since 2×121323431² = 29438749819223522, which 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 (121323031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 556421 + ... + 556638.

It is an arithmetic number, because the mean of its divisors is an integer number (30609150).

Almost surely, 2^121323431 is an apocalyptic number.

121323431 is a deficient number, since it is larger than the sum of its proper divisors (1113169).

121323431 is a wasteful number, since it uses less digits than its factorization.

121323431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1113168.

The product of its digits is 432, while the sum is 20.

The square root of 121323431 is about 11014.6915980430. The cubic root of 121323431 is about 495.0490459174.

Adding to 121323431 its reverse (134323121), we get a palindrome (255646552).

The spelling of 121323431 in words is "one hundred twenty-one million, three hundred twenty-three thousand, four hundred thirty-one".