2220021221 has 8 divisors (see below), whose sum is σ = 2427946464. Its totient is φ = 2013113520.

The previous prime is 2220021149. The next prime is 2220021227. The reversal of 2220021221 is 1221200222.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2220021221 - 2¹⁰ = 2220020197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2220021196 and 2220021205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2220021227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 249815 + ... + 258548.

It is an arithmetic number, because the mean of its divisors is an integer number (303493308).

Almost surely, 2^2220021221 is an apocalyptic number.

It is an amenable number.

2220021221 is a deficient number, since it is larger than the sum of its proper divisors (207925243).

2220021221 is a wasteful number, since it uses less digits than its factorization.

2220021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508771.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 2220021221 is about 47117.1011523417. The cubic root of 2220021221 is about 1304.5249066491.

Adding to 2220021221 its reverse (1221200222), we get a palindrome (3441221443).

The spelling of 2220021221 in words is "two billion, two hundred twenty million, twenty-one thousand, two hundred twenty-one".