2011222002221 has 4 divisors (see below), whose sum is σ = 2011294073052. Its totient is φ = 2011149931392.

The previous prime is 2011222002211. The next prime is 2011222002233. The reversal of 2011222002221 is 1222002221102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1324826322121 + 686395680100 = 1151011^2 + 828490^2 .

It is a cyclic number.

It is not a de Polignac number, because 2011222002221 - 2²² = 2011217807917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2011222002221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011222002211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35993540 + ... + 36049373.

It is an arithmetic number, because the mean of its divisors is an integer number (502823518263).

Almost surely, 2^{2011222002221} is an apocalyptic number.

It is an amenable number.

2011222002221 is a deficient number, since it is larger than the sum of its proper divisors (72070831).

2011222002221 is an equidigital number, since it uses as much as digits as its factorization.

2011222002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72070830.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 2011222002221 its reverse (1222002221102), we get a palindrome (3233224223323).

The spelling of 2011222002221 in words is "two trillion, eleven billion, two hundred twenty-two million, two thousand, two hundred twenty-one".