7221047 has 4 divisors (see below), whose sum is σ = 7454016. Its totient is φ = 6988080.

The previous prime is 7221041. The next prime is 7221077. The reversal of 7221047 is 7401227.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7221047 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7221041) 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, 116438 + ... + 116499.

It is an arithmetic number, because the mean of its divisors is an integer number (1863504).

Almost surely, 2^7221047 is an apocalyptic number.

7221047 is a deficient number, since it is larger than the sum of its proper divisors (232969).

7221047 is a wasteful number, since it uses less digits than its factorization.

7221047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232968.

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 7221047 is about 2687.2005879725. The cubic root of 7221047 is about 193.2858480949.

The spelling of 7221047 in words is "seven million, two hundred twenty-one thousand, forty-seven".