121012210123 has 4 divisors (see below), whose sum is σ = 138299668720. Its totient is φ = 103724751528.

The previous prime is 121012210069. The next prime is 121012210139. The reversal of 121012210123 is 321012210121.

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 121012210123 - 2¹³ = 121012201931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121012210097 and 121012210106.

It is not an unprimeable number, because it can be changed into a prime (121012210183) 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, 8643729288 + ... + 8643729301.

It is an arithmetic number, because the mean of its divisors is an integer number (34574917180).

Almost surely, 2^121012210123 is an apocalyptic number.

121012210123 is a deficient number, since it is larger than the sum of its proper divisors (17287458597).

121012210123 is an equidigital number, since it uses as much as digits as its factorization.

121012210123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17287458596.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 121012210123 its reverse (321012210121), we get a palindrome (442024420244).

The spelling of 121012210123 in words is "one hundred twenty-one billion, twelve million, two hundred ten thousand, one hundred twenty-three".