2201211201221 has 4 divisors (see below), whose sum is σ = 2201223979500. Its totient is φ = 2201198422944.

The previous prime is 2201211201151. The next prime is 2201211201247. The reversal of 2201211201221 is 1221021121022.

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 239850165025 + 1961361036196 = 489745^2 + 1400486^2 .

It is a cyclic number.

It is not a de Polignac number, because 2201211201221 - 2¹⁸ = 2201210939077 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2201211201221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2201211201281) 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, 6127166 + ... + 6476463.

It is an arithmetic number, because the mean of its divisors is an integer number (550305994875).

Almost surely, 2^{2201211201221} is an apocalyptic number.

It is an amenable number.

2201211201221 is a deficient number, since it is larger than the sum of its proper divisors (12778279).

2201211201221 is a wasteful number, since it uses less digits than its factorization.

2201211201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12778278.

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

Adding to 2201211201221 its reverse (1221021121022), we get a palindrome (3422232322243).

The spelling of 2201211201221 in words is "two trillion, two hundred one billion, two hundred eleven million, two hundred one thousand, two hundred twenty-one".