1211011222009 has 2 divisors, whose sum is σ = 1211011222010. Its totient is φ = 1211011222008.

The previous prime is 1211011221971. The next prime is 1211011222013. The reversal of 1211011222009 is 9002221101121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1039068306409 + 171942915600 = 1019347^2 + 414660^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211011222009 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211011222909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605505611004 + 605505611005.

It is an arithmetic number, because the mean of its divisors is an integer number (605505611005).

Almost surely, 2^{1211011222009} is an apocalyptic number.

It is an amenable number.

1211011222009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211011222009 is an equidigital number, since it uses as much as digits as its factorization.

1211011222009 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 22.

The spelling of 1211011222009 in words is "one trillion, two hundred eleven billion, eleven million, two hundred twenty-two thousand, nine".