2211101012221 has 4 divisors (see below), whose sum is σ = 2265030305244. Its totient is φ = 2157171719200.

The previous prime is 2211101012203. The next prime is 2211101012243. The reversal of 2211101012221 is 1222101011122.

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 99862952121 + 2111238060100 = 316011^2 + 1453010^2 .

It is a cyclic number.

It is not a de Polignac number, because 2211101012221 - 2⁷ = 2211101012093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2211101012195 and 2211101012204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211101012251) 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, 26964646450 + ... + 26964646531.

It is an arithmetic number, because the mean of its divisors is an integer number (566257576311).

Almost surely, 2^{2211101012221} is an apocalyptic number.

It is an amenable number.

2211101012221 is a deficient number, since it is larger than the sum of its proper divisors (53929293023).

2211101012221 is an equidigital number, since it uses as much as digits as its factorization.

2211101012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53929293022.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 2211101012221 its reverse (1222101011122), we get a palindrome (3433202023343).

The spelling of 2211101012221 in words is "two trillion, two hundred eleven billion, one hundred one million, twelve thousand, two hundred twenty-one".