121123210031 has 4 divisors (see below), whose sum is σ = 121148860152. Its totient is φ = 121097559912.

The previous prime is 121123209971. The next prime is 121123210057. The reversal of 121123210031 is 130012321121.

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

It is a cyclic number.

It is not a de Polignac number, because 121123210031 - 2⁶ = 121123209967 is a prime.

It is a super-2 number, since 2×121123210031² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121123209991 and 121123210009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121123210081) 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, 12817976 + ... + 12827421.

It is an arithmetic number, because the mean of its divisors is an integer number (30287215038).

Almost surely, 2^121123210031 is an apocalyptic number.

121123210031 is a deficient number, since it is larger than the sum of its proper divisors (25650121).

121123210031 is an equidigital number, since it uses as much as digits as its factorization.

121123210031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25650120.

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

Adding to 121123210031 its reverse (130012321121), we get a palindrome (251135531152).

The spelling of 121123210031 in words is "one hundred twenty-one billion, one hundred twenty-three million, two hundred ten thousand, thirty-one".