2011220999 has 2 divisors, whose sum is σ = 2011221000. Its totient is φ = 2011220998.

The previous prime is 2011220957. The next prime is 2011221049. The reversal of 2011220999 is 9990221102.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2011220999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2011220399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005610499 + 1005610500.

It is an arithmetic number, because the mean of its divisors is an integer number (1005610500).

Almost surely, 2^2011220999 is an apocalyptic number.

2011220999 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011220999 is an equidigital number, since it uses as much as digits as its factorization.

2011220999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 2011220999 is about 44846.6386588783. The cubic root of 2011220999 is about 1262.2729191165.

The spelling of 2011220999 in words is "two billion, eleven million, two hundred twenty thousand, nine hundred ninety-nine".