7222615221 has 4 divisors (see below), whose sum is σ = 9630153632. Its totient is φ = 4815076812.

The previous prime is 7222615219. The next prime is 7222615241. The reversal of 7222615221 is 1225162227.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1225162227 = 3 ⋅408387409.

It is not a de Polignac number, because 7222615221 - 2¹ = 7222615219 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 (7222615241) 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, 1203769201 + ... + 1203769206.

It is an arithmetic number, because the mean of its divisors is an integer number (2407538408).

Almost surely, 2^7222615221 is an apocalyptic number.

It is an amenable number.

7222615221 is a deficient number, since it is larger than the sum of its proper divisors (2407538411).

7222615221 is a wasteful number, since it uses less digits than its factorization.

7222615221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2407538410.

The product of its digits is 6720, while the sum is 30.

The square root of 7222615221 is about 84985.9707304682. The cubic root of 7222615221 is about 1932.9983927858.

Adding to 7222615221 its reverse (1225162227), we get a palindrome (8447777448).

The spelling of 7222615221 in words is "seven billion, two hundred twenty-two million, six hundred fifteen thousand, two hundred twenty-one".