201211120991 has 2 divisors, whose sum is σ = 201211120992. Its totient is φ = 201211120990.

The previous prime is 201211120939. The next prime is 201211121063. The reversal of 201211120991 is 199021112102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201211120991 - 2¹⁴ = 201211104607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201211120921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100605560495 + 100605560496.

It is an arithmetic number, because the mean of its divisors is an integer number (100605560496).

Almost surely, 2^201211120991 is an apocalyptic number.

201211120991 is a deficient number, since it is larger than the sum of its proper divisors (1).

201211120991 is an equidigital number, since it uses as much as digits as its factorization.

201211120991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 29.

The spelling of 201211120991 in words is "two hundred one billion, two hundred eleven million, one hundred twenty thousand, nine hundred ninety-one".