7221913 has 4 divisors (see below), whose sum is σ = 7309008. Its totient is φ = 7134820.

The previous prime is 7221911. The next prime is 7221917. The reversal of 7221913 is 3191227.

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 7221913 - 2¹ = 7221911 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7221911) 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, 43423 + ... + 43588.

It is an arithmetic number, because the mean of its divisors is an integer number (1827252).

Almost surely, 2^7221913 is an apocalyptic number.

It is an amenable number.

7221913 is a deficient number, since it is larger than the sum of its proper divisors (87095).

7221913 is an equidigital number, since it uses as much as digits as its factorization.

7221913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87094.

The product of its digits is 756, while the sum is 25.

The square root of 7221913 is about 2687.3617173726. The cubic root of 7221913 is about 193.2935745300.

The spelling of 7221913 in words is "seven million, two hundred twenty-one thousand, nine hundred thirteen".