121121203031 has 4 divisors (see below), whose sum is σ = 123698249952. Its totient is φ = 118544156112.

The previous prime is 121121203019. The next prime is 121121203043. The reversal of 121121203031 is 130302121121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130302121121 = 2447 ⋅53249743.

It is an interprime number because it is at equal distance from previous prime (121121203019) and next prime (121121203043).

It is a cyclic number.

It is not a de Polignac number, because 121121203031 - 2⁶ = 121121202967 is a prime.

It is a super-2 number, since 2×121121203031² (a number of 23 digits) 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 (121121205031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1288523390 + ... + 1288523483.

It is an arithmetic number, because the mean of its divisors is an integer number (30924562488).

Almost surely, 2^121121203031 is an apocalyptic number.

121121203031 is a deficient number, since it is larger than the sum of its proper divisors (2577046921).

121121203031 is an equidigital number, since it uses as much as digits as its factorization.

121121203031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2577046920.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 121121203031 its reverse (130302121121), we get a palindrome (251423324152).

The spelling of 121121203031 in words is "one hundred twenty-one billion, one hundred twenty-one million, two hundred three thousand, thirty-one".