2210001221 has 4 divisors (see below), whose sum is σ = 2237976000. Its totient is φ = 2182026444.

The previous prime is 2210001181. The next prime is 2210001239. The reversal of 2210001221 is 1221000122.

It is a happy number.

2210001221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2210001221 - 2²⁶ = 2142892357 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 (2210001251) 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, 13987271 + ... + 13987428.

It is an arithmetic number, because the mean of its divisors is an integer number (559494000).

Almost surely, 2^2210001221 is an apocalyptic number.

It is an amenable number.

2210001221 is a deficient number, since it is larger than the sum of its proper divisors (27974779).

2210001221 is an equidigital number, since it uses as much as digits as its factorization.

2210001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27974778.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2210001221 is about 47010.6500805934. The cubic root of 2210001221 is about 1302.5593016056.

Adding to 2210001221 its reverse (1221000122), we get a palindrome (3431001343).

The spelling of 2210001221 in words is "two billion, two hundred ten million, one thousand, two hundred twenty-one".