123102312121 has 16 divisors (see below), whose sum is σ = 131404170240. Its totient is φ = 114988340880.

The previous prime is 123102312119. The next prime is 123102312127. The reversal of 123102312121 is 121213201321.

It is a cyclic number.

It is not a de Polignac number, because 123102312121 - 2¹ = 123102312119 is a prime.

It is a super-2 number, since 2×123102312121² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (123102312127) 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, 715636 + ... + 870826.

It is an arithmetic number, because the mean of its divisors is an integer number (8212760640).

Almost surely, 2^123102312121 is an apocalyptic number.

It is an amenable number.

123102312121 is a deficient number, since it is larger than the sum of its proper divisors (8301858119).

123102312121 is a wasteful number, since it uses less digits than its factorization.

123102312121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155796.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 123102312121 its reverse (121213201321), we get a palindrome (244315513442).

The spelling of 123102312121 in words is "one hundred twenty-three billion, one hundred two million, three hundred twelve thousand, one hundred twenty-one".