7700221 has 4 divisors (see below), whose sum is σ = 7709152. Its totient is φ = 7691292.

The previous prime is 7700179. The next prime is 7700227. The reversal of 7700221 is 1220077.

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 7700221 - 2¹⁵ = 7667453 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 (7700227) 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, 3015 + ... + 4948.

It is an arithmetic number, because the mean of its divisors is an integer number (1927288).

Almost surely, 2^7700221 is an apocalyptic number.

It is an amenable number.

7700221 is a deficient number, since it is larger than the sum of its proper divisors (8931).

7700221 is an equidigital number, since it uses as much as digits as its factorization.

7700221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8930.

The product of its (nonzero) digits is 196, while the sum is 19.

The square root of 7700221 is about 2774.9272062524. The cubic root of 7700221 is about 197.4699714000.

Adding to 7700221 its reverse (1220077), we get a palindrome (8920298).

It can be divided in two parts, 7700 and 221, that added together give a square (7921 = 89²).

The spelling of 7700221 in words is "seven million, seven hundred thousand, two hundred twenty-one".