7221442857 has 4 divisors (see below), whose sum is σ = 9628590480. Its totient is φ = 4814295236.

The previous prime is 7221442853. The next prime is 7221442889. The reversal of 7221442857 is 7582441227.

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 7221442857 - 2² = 7221442853 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7221442853) 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, 1203573807 + ... + 1203573812.

It is an arithmetic number, because the mean of its divisors is an integer number (2407147620).

Almost surely, 2^7221442857 is an apocalyptic number.

It is an amenable number.

7221442857 is a deficient number, since it is larger than the sum of its proper divisors (2407147623).

7221442857 is a wasteful number, since it uses less digits than its factorization.

7221442857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2407147622.

The product of its digits is 250880, while the sum is 42.

The square root of 7221442857 is about 84979.0730533112. The cubic root of 7221442857 is about 1932.8937999994.

The spelling of 7221442857 in words is "seven billion, two hundred twenty-one million, four hundred forty-two thousand, eight hundred fifty-seven".