12100010121 has 10 divisors (see below), whose sum is σ = 18075323882. Its totient is φ = 8066673360.

The previous prime is 12100010113. The next prime is 12100010123. The reversal of 12100010121 is 12101000121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11462700096 + 637310025 = 107064^2 + 25245^2 .

It is not a de Polignac number, because 12100010121 - 2³ = 12100010113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12100010123) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 74691340 + ... + 74691501.

Almost surely, 2^12100010121 is an apocalyptic number.

It is an amenable number.

12100010121 is a deficient number, since it is larger than the sum of its proper divisors (5975313761).

12100010121 is an equidigital number, since it uses as much as digits as its factorization.

12100010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149382853 (or 149382844 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 12100010121 its reverse (12101000121), we get a palindrome (24201010242).

The spelling of 12100010121 in words is "twelve billion, one hundred million, ten thousand, one hundred twenty-one".