121220231100123 has 16 divisors (see below), whose sum is σ = 171134745714720. Its totient is φ = 76059618710016.

The previous prime is 121220231100091. The next prime is 121220231100127. The reversal of 121220231100123 is 321001132022121.

It is not a de Polignac number, because 121220231100123 - 2⁵ = 121220231100091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121220231100123.

It is not an unprimeable number, because it can be changed into a prime (121220231100127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32721661 + ... + 36237377.

It is an arithmetic number, because the mean of its divisors is an integer number (10695921607170).

Almost surely, 2^{121220231100123} is an apocalyptic number.

121220231100123 is a deficient number, since it is larger than the sum of its proper divisors (49914514614597).

121220231100123 is a wasteful number, since it uses less digits than its factorization.

121220231100123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4191806.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 121220231100123 its reverse (321001132022121), we get a palindrome (442221363122244).

The spelling of 121220231100123 in words is "one hundred twenty-one trillion, two hundred twenty billion, two hundred thirty-one million, one hundred thousand, one hundred twenty-three".