121220431 has 4 divisors (see below), whose sum is σ = 121257864. Its totient is φ = 121183000.

The previous prime is 121220413. The next prime is 121220441. The reversal of 121220431 is 134022121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134022121 = 1171 ⋅114451.

It is a cyclic number.

It is not a de Polignac number, because 121220431 - 2⁷ = 121220303 is a prime.

It is a super-2 number, since 2×121220431² = 29388785783651522, 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 (121220401) 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, 13345 + ... + 20506.

It is an arithmetic number, because the mean of its divisors is an integer number (30314466).

Almost surely, 2^121220431 is an apocalyptic number.

121220431 is a deficient number, since it is larger than the sum of its proper divisors (37433).

121220431 is an equidigital number, since it uses as much as digits as its factorization.

121220431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37432.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 121220431 is about 11010.0150317790. The cubic root of 121220431 is about 494.9089122603.

Adding to 121220431 its reverse (134022121), we get a palindrome (255242552).

The spelling of 121220431 in words is "one hundred twenty-one million, two hundred twenty thousand, four hundred thirty-one".