7221310231 has 4 divisors (see below), whose sum is σ = 7240364200. Its totient is φ = 7202256264.

The previous prime is 7221310199. The next prime is 7221310241. The reversal of 7221310231 is 1320131227.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7221310231 - 2⁵ = 7221310199 is a prime.

It is a super-2 number, since 2×7221310231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7221310241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9526416 + ... + 9527173.

It is an arithmetic number, because the mean of its divisors is an integer number (1810091050).

Almost surely, 2^7221310231 is an apocalyptic number.

7221310231 is a deficient number, since it is larger than the sum of its proper divisors (19053969).

7221310231 is a wasteful number, since it uses less digits than its factorization.

7221310231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19053968.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 7221310231 is about 84978.2927046666. The cubic root of 7221310231 is about 1932.8819670205.

Adding to 7221310231 its reverse (1320131227), we get a palindrome (8541441458).

The spelling of 7221310231 in words is "seven billion, two hundred twenty-one million, three hundred ten thousand, two hundred thirty-one".