2011222220221 has 4 divisors (see below), whose sum is σ = 2031956470012. Its totient is φ = 1990487970432.

The previous prime is 2011222220219. The next prime is 2011222220263. The reversal of 2011222220221 is 1220222221102.

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 1192712988996 + 818509231225 = 1092114^2 + 904715^2 .

It is a cyclic number.

It is not a de Polignac number, because 2011222220221 - 2¹ = 2011222220219 is a prime.

It is a super-2 number, since 2×2011222220221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011222220321) 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, 10367124750 + ... + 10367124943.

It is an arithmetic number, because the mean of its divisors is an integer number (507989117503).

Almost surely, 2^{2011222220221} is an apocalyptic number.

It is an amenable number.

2011222220221 is a deficient number, since it is larger than the sum of its proper divisors (20734249791).

2011222220221 is an equidigital number, since it uses as much as digits as its factorization.

2011222220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20734249790.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 2011222220221 its reverse (1220222221102), we get a palindrome (3231444441323).

The spelling of 2011222220221 in words is "two trillion, eleven billion, two hundred twenty-two million, two hundred twenty thousand, two hundred twenty-one".