12123011121 has 16 divisors (see below), whose sum is σ = 17409692160. Its totient is φ = 7459332480.

The previous prime is 12123011081. The next prime is 12123011167. The reversal of 12123011121 is 12111032121.

It is not a de Polignac number, because 12123011121 - 2¹³ = 12123002929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12123011121.

It is not an unprimeable number, because it can be changed into a prime (12123011521) 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, 377661 + ... + 408501.

It is an arithmetic number, because the mean of its divisors is an integer number (1088105760).

Almost surely, 2^12123011121 is an apocalyptic number.

It is an amenable number.

12123011121 is a deficient number, since it is larger than the sum of its proper divisors (5286681039).

12123011121 is a wasteful number, since it uses less digits than its factorization.

12123011121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40936.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 12123011121 its reverse (12111032121), we get a palindrome (24234043242).

The spelling of 12123011121 in words is "twelve billion, one hundred twenty-three million, eleven thousand, one hundred twenty-one".