2221021213 has 4 divisors (see below), whose sum is σ = 2226820608. Its totient is φ = 2215221820.

The previous prime is 2221021189. The next prime is 2221021249. The reversal of 2221021213 is 3121201222.

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.

It is a cyclic number.

It is not a de Polignac number, because 2221021213 - 2⁵ = 2221021181 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 (2221721213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2899123 + ... + 2899888.

It is an arithmetic number, because the mean of its divisors is an integer number (556705152).

Almost surely, 2^2221021213 is an apocalyptic number.

It is an amenable number.

2221021213 is a deficient number, since it is larger than the sum of its proper divisors (5799395).

2221021213 is an equidigital number, since it uses as much as digits as its factorization.

2221021213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5799394.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2221021213 is about 47127.7117309975. The cubic root of 2221021213 is about 1304.7207484181.

Adding to 2221021213 its reverse (3121201222), we get a palindrome (5342222435).

Subtracting 2221021213 from its reverse (3121201222), we obtain a square (900180009 = 30003²).

The spelling of 2221021213 in words is "two billion, two hundred twenty-one million, twenty-one thousand, two hundred thirteen".