2211101221 has 16 divisors (see below), whose sum is σ = 2573569408. Its totient is φ = 1860408000.

The previous prime is 2211101197. The next prime is 2211101239. The reversal of 2211101221 is 1221011122.

It is a cyclic number.

It is not a de Polignac number, because 2211101221 - 2²¹ = 2209004069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211101521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 218371 + ... + 228271.

It is an arithmetic number, because the mean of its divisors is an integer number (160848088).

Almost surely, 2^2211101221 is an apocalyptic number.

It is an amenable number.

2211101221 is a deficient number, since it is larger than the sum of its proper divisors (362468187).

2211101221 is an equidigital number, since it uses as much as digits as its factorization.

2211101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10492.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 2211101221 is about 47022.3481017271. The cubic root of 2211101221 is about 1302.7753765353.

Adding to 2211101221 its reverse (1221011122), we get a palindrome (3432112343).

Subtracting from 2211101221 its reverse (1221011122), we obtain a palindrome (990090099).

The spelling of 2211101221 in words is "two billion, two hundred eleven million, one hundred one thousand, two hundred twenty-one".