2011222001221 has 4 divisors (see below), whose sum is σ = 2031135090444. Its totient is φ = 1991308912000.

The previous prime is 2011222001183. The next prime is 2011222001293. The reversal of 2011222001221 is 1221002221102.

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 1678996569121 + 332225432100 = 1295761^2 + 576390^2 .

It is a cyclic number.

It is not a de Polignac number, because 2011222001221 - 2²⁵ = 2011188446789 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2011222001195 and 2011222001204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011292001221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9956544460 + ... + 9956544661.

It is an arithmetic number, because the mean of its divisors is an integer number (507783772611).

Almost surely, 2^{2011222001221} is an apocalyptic number.

It is an amenable number.

2011222001221 is a deficient number, since it is larger than the sum of its proper divisors (19913089223).

2011222001221 is a wasteful number, since it uses less digits than its factorization.

2011222001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19913089222.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2011222001221 its reverse (1221002221102), we get a palindrome (3232224222323).

The spelling of 2011222001221 in words is "two trillion, eleven billion, two hundred twenty-two million, one thousand, two hundred twenty-one".