7220220221 has 8 divisors (see below), whose sum is σ = 7264210464. Its totient is φ = 7176256240.

The previous prime is 7220220193. The next prime is 7220220251. The reversal of 7220220221 is 1220220227.

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

It is a cyclic number.

It is not a de Polignac number, because 7220220221 - 2¹⁸ = 7219958077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7220220193 and 7220220202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7220220251) 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, 1032266 + ... + 1039236.

It is an arithmetic number, because the mean of its divisors is an integer number (908026308).

Almost surely, 2^7220220221 is an apocalyptic number.

It is an amenable number.

7220220221 is a deficient number, since it is larger than the sum of its proper divisors (43990243).

7220220221 is a wasteful number, since it uses less digits than its factorization.

7220220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13131.

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 7220220221 is about 84971.8790012319. The cubic root of 7220220221 is about 1932.7847101230.

Adding to 7220220221 its reverse (1220220227), we get a palindrome (8440440448).

The spelling of 7220220221 in words is "seven billion, two hundred twenty million, two hundred twenty thousand, two hundred twenty-one".