22221797 has 8 divisors (see below), whose sum is σ = 24055416. Its totient is φ = 20405952.

The previous prime is 22221781. The next prime is 22221799. The reversal of 22221797 is 79712222.

It is a Cunningham number, because it is equal to 4714²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 3290596 + 18931201 = 1814^2 + 4351^2 .

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 22221797 - 2⁴ = 22221781 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 (22221799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1778 + ... + 6899.

It is an arithmetic number, because the mean of its divisors is an integer number (3006927).

Almost surely, 2^22221797 is an apocalyptic number.

It is an amenable number.

22221797 is a deficient number, since it is larger than the sum of its proper divisors (1833619).

22221797 is a wasteful number, since it uses less digits than its factorization.

22221797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8887.

The product of its digits is 7056, while the sum is 32.

The square root of 22221797 is about 4714.0001060670. Note that the first 3 decimals coincide. The cubic root of 22221797 is about 281.1424285243.

The spelling of 22221797 in words is "twenty-two million, two hundred twenty-one thousand, seven hundred ninety-seven".