20012212009 has 2 divisors, whose sum is σ = 20012212010. Its totient is φ = 20012212008.

The previous prime is 20012211949. The next prime is 20012212067. The reversal of 20012212009 is 90021221002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12152857600 + 7859354409 = 110240^2 + 88653^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012212009 - 2²¹ = 20010114857 is a prime.

It is not a weakly prime, because it can be changed into another prime (20012212069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006106004 + 10006106005.

It is an arithmetic number, because the mean of its divisors is an integer number (10006106005).

Almost surely, 2^20012212009 is an apocalyptic number.

It is an amenable number.

20012212009 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012212009 is an equidigital number, since it uses as much as digits as its factorization.

20012212009 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 19.

The spelling of 20012212009 in words is "twenty billion, twelve million, two hundred twelve thousand, nine".