123130203121 has 4 divisors (see below), whose sum is σ = 123137536500. Its totient is φ = 123122869744.

The previous prime is 123130203101. The next prime is 123130203137. The reversal of 123130203121 is 121302031321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121302031321 = 3461 ⋅35048261.

It can be written as a sum of positive squares in 2 ways, for example, as 35594104896 + 87536098225 = 188664^2 + 295865^2 .

It is a cyclic number.

It is not a de Polignac number, because 123130203121 - 2⁹ = 123130202609 is a prime.

It is a super-2 number, since 2×123130203121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123130203101) 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, 3641446 + ... + 3675103.

It is an arithmetic number, because the mean of its divisors is an integer number (30784384125).

Almost surely, 2^123130203121 is an apocalyptic number.

It is an amenable number.

123130203121 is a deficient number, since it is larger than the sum of its proper divisors (7333379).

123130203121 is an equidigital number, since it uses as much as digits as its factorization.

123130203121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7333378.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 123130203121 its reverse (121302031321), we get a palindrome (244432234442).

The spelling of 123130203121 in words is "one hundred twenty-three billion, one hundred thirty million, two hundred three thousand, one hundred twenty-one".