7221247 has 8 divisors (see below), whose sum is σ = 7926912. Its totient is φ = 6523800.

The previous prime is 7221199. The next prime is 7221251. The reversal of 7221247 is 7421227.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7221247 - 2¹⁹ = 6696959 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 (7221257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129 + ... + 3802.

It is an arithmetic number, because the mean of its divisors is an integer number (990864).

Almost surely, 2^7221247 is an apocalyptic number.

7221247 is a deficient number, since it is larger than the sum of its proper divisors (705665).

7221247 is a wasteful number, since it uses less digits than its factorization.

7221247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4109.

The product of its digits is 1568, while the sum is 25.

The square root of 7221247 is about 2687.2378011631. The cubic root of 7221247 is about 193.2876325458.

The spelling of 7221247 in words is "seven million, two hundred twenty-one thousand, two hundred forty-seven".