7223642221 has 4 divisors (see below), whose sum is σ = 7223876352. Its totient is φ = 7223408092.

The previous prime is 7223642207. The next prime is 7223642291. The reversal of 7223642221 is 1222463227.

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 7223642221 - 2⁷ = 7223642093 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 (7223642291) 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, 62221 + ... + 135346.

It is an arithmetic number, because the mean of its divisors is an integer number (1805969088).

Almost surely, 2^7223642221 is an apocalyptic number.

It is an amenable number.

7223642221 is a deficient number, since it is larger than the sum of its proper divisors (234131).

7223642221 is a wasteful number, since it uses less digits than its factorization.

7223642221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234130.

The product of its digits is 16128, while the sum is 31.

The square root of 7223642221 is about 84992.0126894286. The cubic root of 7223642221 is about 1933.0900075819.

The spelling of 7223642221 in words is "seven billion, two hundred twenty-three million, six hundred forty-two thousand, two hundred twenty-one".