20122112009 has 2 divisors, whose sum is σ = 20122112010. Its totient is φ = 20122112008.

The previous prime is 20122111993. The next prime is 20122112053. The reversal of 20122112009 is 90021122102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19304323600 + 817788409 = 138940^2 + 28597^2 .

It is a cyclic number.

It is not a de Polignac number, because 20122112009 - 2⁴ = 20122111993 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 (20122117009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061056004 + 10061056005.

It is an arithmetic number, because the mean of its divisors is an integer number (10061056005).

Almost surely, 2^20122112009 is an apocalyptic number.

It is an amenable number.

20122112009 is a deficient number, since it is larger than the sum of its proper divisors (1).

20122112009 is an equidigital number, since it uses as much as digits as its factorization.

20122112009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 20122112009 in words is "twenty billion, one hundred twenty-two million, one hundred twelve thousand, nine".