16106440121 has 2 divisors, whose sum is σ = 16106440122. Its totient is φ = 16106440120.

The previous prime is 16106440081. The next prime is 16106440127. The reversal of 16106440121 is 12104460161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12918595600 + 3187844521 = 113660^2 + 56461^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16106440121 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (16106440127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8053220060 + 8053220061.

It is an arithmetic number, because the mean of its divisors is an integer number (8053220061).

Almost surely, 2^16106440121 is an apocalyptic number.

It is an amenable number.

16106440121 is a deficient number, since it is larger than the sum of its proper divisors (1).

16106440121 is an equidigital number, since it uses as much as digits as its factorization.

16106440121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The spelling of 16106440121 in words is "sixteen billion, one hundred six million, four hundred forty thousand, one hundred twenty-one".