7221537707 has 4 divisors (see below), whose sum is σ = 7228975896. Its totient is φ = 7214099520.

The previous prime is 7221537679. The next prime is 7221537709. The reversal of 7221537707 is 7077351227.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7077351227 = 47 ⋅150581941.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7221537707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7221537709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3717638 + ... + 3719579.

It is an arithmetic number, because the mean of its divisors is an integer number (1807243974).

Almost surely, 2^7221537707 is an apocalyptic number.

7221537707 is a deficient number, since it is larger than the sum of its proper divisors (7438189).

7221537707 is an equidigital number, since it uses as much as digits as its factorization.

7221537707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7438188.

The product of its (nonzero) digits is 144060, while the sum is 41.

The square root of 7221537707 is about 84979.6311300537. The cubic root of 7221537707 is about 1932.9022624898.

The spelling of 7221537707 in words is "seven billion, two hundred twenty-one million, five hundred thirty-seven thousand, seven hundred seven".