2011011222221 has 4 divisors (see below), whose sum is σ = 2021219401212. Its totient is φ = 2000803043232.

The previous prime is 2011011222193. The next prime is 2011011222229. The reversal of 2011011222221 is 1222221101102.

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 1083651852196 + 927359370025 = 1040986^2 + 962995^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2011011222221 is a prime.

It is a super-2 number, since 2×2011011222221² (a number of 25 digits) contains 22 as substring.

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 2011011222221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011011222229) 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, 5104089200 + ... + 5104089593.

It is an arithmetic number, because the mean of its divisors is an integer number (505304850303).

Almost surely, 2^{2011011222221} is an apocalyptic number.

It is an amenable number.

2011011222221 is a deficient number, since it is larger than the sum of its proper divisors (10208178991).

2011011222221 is a wasteful number, since it uses less digits than its factorization.

2011011222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10208178990.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2011011222221 its reverse (1222221101102), we get a palindrome (3233232323323).

The spelling of 2011011222221 in words is "two trillion, eleven billion, eleven million, two hundred twenty-two thousand, two hundred twenty-one".