7221494813 has 4 divisors (see below), whose sum is σ = 7776994428. Its totient is φ = 6665995200.

The previous prime is 7221494809. The next prime is 7221494831. The reversal of 7221494813 is 3184941227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3184941227 = 13 ⋅244995479.

It can be written as a sum of positive squares in 2 ways, for example, as 3943588804 + 3277906009 = 62798^2 + 57253^2 .

It is a cyclic number.

It is not a de Polignac number, because 7221494813 - 2² = 7221494809 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 (7221494843) 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, 277749788 + ... + 277749813.

It is an arithmetic number, because the mean of its divisors is an integer number (1944248607).

Almost surely, 2^7221494813 is an apocalyptic number.

It is an amenable number.

7221494813 is a deficient number, since it is larger than the sum of its proper divisors (555499615).

7221494813 is a wasteful number, since it uses less digits than its factorization.

7221494813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555499614.

The product of its digits is 96768, while the sum is 41.

The square root of 7221494813 is about 84979.3787515536. The cubic root of 7221494813 is about 1932.8984355083.

The spelling of 7221494813 in words is "seven billion, two hundred twenty-one million, four hundred ninety-four thousand, eight hundred thirteen".