1201212212009 has 2 divisors, whose sum is σ = 1201212212010. Its totient is φ = 1201212212008.

The previous prime is 1201212211993. The next prime is 1201212212051. The reversal of 1201212212009 is 9002122121021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1194710208784 + 6502003225 = 1093028^2 + 80635^2 .

It is an emirp because it is prime and its reverse (9002122121021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1201212212009 - 2⁴ = 1201212211993 is a prime.

It is not a weakly prime, because it can be changed into another prime (1201212212099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600606106004 + 600606106005.

It is an arithmetic number, because the mean of its divisors is an integer number (600606106005).

Almost surely, 2^{1201212212009} is an apocalyptic number.

It is an amenable number.

1201212212009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201212212009 is an equidigital number, since it uses as much as digits as its factorization.

1201212212009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 1201212212009 in words is "one trillion, two hundred one billion, two hundred twelve million, two hundred twelve thousand, nine".