123201020121 has 16 divisors (see below), whose sum is σ = 165822142464. Its totient is φ = 81357131024.

The previous prime is 123201020087. The next prime is 123201020149. The reversal of 123201020121 is 121020102321.

It is a cyclic number.

It is not a de Polignac number, because 123201020121 - 2²⁷ = 123066802393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123201020121.

It is not an unprimeable number, because it can be changed into a prime (123201060121) 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, 3882100 + ... + 3913706.

It is an arithmetic number, because the mean of its divisors is an integer number (10363883904).

Almost surely, 2^123201020121 is an apocalyptic number.

It is an amenable number.

123201020121 is a deficient number, since it is larger than the sum of its proper divisors (42621122343).

123201020121 is a wasteful number, since it uses less digits than its factorization.

123201020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43860.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 123201020121 its reverse (121020102321), we get a palindrome (244221122442).

The spelling of 123201020121 in words is "one hundred twenty-three billion, two hundred one million, twenty thousand, one hundred twenty-one".