2201221021 has 4 divisors (see below), whose sum is σ = 2202731200. Its totient is φ = 2199710844.

The previous prime is 2201221019. The next prime is 2201221027. The reversal of 2201221021 is 1201221022.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1201221022 = 2 ⋅600610511.

It is a cyclic number.

It is not a de Polignac number, because 2201221021 - 2¹ = 2201221019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2201220992 and 2201221010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2201221027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 752901 + ... + 755818.

It is an arithmetic number, because the mean of its divisors is an integer number (550682800).

Almost surely, 2^2201221021 is an apocalyptic number.

It is an amenable number.

2201221021 is a deficient number, since it is larger than the sum of its proper divisors (1510179).

2201221021 is a wasteful number, since it uses less digits than its factorization.

2201221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1510178.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 2201221021 is about 46917.1719203108. The cubic root of 2201221021 is about 1300.8320159067.

Adding to 2201221021 its reverse (1201221022), we get a palindrome (3402442043).

Subtracting from 2201221021 its reverse (1201221022), we obtain a palindrome (999999999).

The spelling of 2201221021 in words is "two billion, two hundred one million, two hundred twenty-one thousand, twenty-one".