201211999999 has 2 divisors, whose sum is σ = 201212000000. Its totient is φ = 201211999998.

The previous prime is 201211999981. The next prime is 201212000009. The reversal of 201211999999 is 999999112102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201211999999 - 2²⁷ = 201077782271 is a prime.

201211999999 is a modest number, since divided by 999999 gives 201211 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201211999799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100605999999 + 100606000000.

It is an arithmetic number, because the mean of its divisors is an integer number (100606000000).

Almost surely, 2^201211999999 is an apocalyptic number.

201211999999 is a deficient number, since it is larger than the sum of its proper divisors (1).

201211999999 is an equidigital number, since it uses as much as digits as its factorization.

201211999999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2125764, while the sum is 61.

The spelling of 201211999999 in words is "two hundred one billion, two hundred eleven million, nine hundred ninety-nine thousand, nine hundred ninety-nine".