121220031 has 4 divisors (see below), whose sum is σ = 161626712. Its totient is φ = 80813352.

The previous prime is 121220023. The next prime is 121220041. The reversal of 121220031 is 130022121.

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

It is not a de Polignac number, because 121220031 - 2³ = 121220023 is a prime.

It is a super-2 number, since 2×121220031² = 29388591831281922, 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 = 121219989 and 121220016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220041) 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, 20203336 + ... + 20203341.

It is an arithmetic number, because the mean of its divisors is an integer number (40406678).

Almost surely, 2^121220031 is an apocalyptic number.

121220031 is a deficient number, since it is larger than the sum of its proper divisors (40406681).

121220031 is an equidigital number, since it uses as much as digits as its factorization.

121220031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40406680.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 121220031 is about 11009.9968664846. The cubic root of 121220031 is about 494.9083678972.

Adding to 121220031 its reverse (130022121), we get a palindrome (251242152).

The spelling of 121220031 in words is "one hundred twenty-one million, two hundred twenty thousand, thirty-one".