12400044121 has 2 divisors, whose sum is σ = 12400044122. Its totient is φ = 12400044120.

The previous prime is 12400044109. The next prime is 12400044131. The reversal of 12400044121 is 12144000421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12392142400 + 7901721 = 111320^2 + 2811^2 .

It is a cyclic number.

It is not a de Polignac number, because 12400044121 - 2¹¹ = 12400042073 is a prime.

It is a super-2 number, since 2×12400044121² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12400044131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6200022060 + 6200022061.

It is an arithmetic number, because the mean of its divisors is an integer number (6200022061).

Almost surely, 2^12400044121 is an apocalyptic number.

It is an amenable number.

12400044121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12400044121 is an equidigital number, since it uses as much as digits as its factorization.

12400044121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 12400044121 its reverse (12144000421), we get a palindrome (24544044542).

The spelling of 12400044121 in words is "twelve billion, four hundred million, forty-four thousand, one hundred twenty-one".