22221716 has 36 divisors (see below), whose sum is σ = 44805600. Its totient is φ = 9562320.

The previous prime is 22221709. The next prime is 22221739. The reversal of 22221716 is 61712222.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 22221691 and 22221700.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15185 + ... + 16583.

It is an arithmetic number, because the mean of its divisors is an integer number (1244600).

Almost surely, 2^22221716 is an apocalyptic number.

It is an amenable number.

22221716 is an abundant number, since it is smaller than the sum of its proper divisors (22583884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22221716 is a wasteful number, since it uses less digits than its factorization.

22221716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1452 (or 1431 counting only the distinct ones).

The product of its digits is 672, while the sum is 23.

The square root of 22221716 is about 4713.9915146296. The cubic root of 22221716 is about 281.1420869292.

Adding to 22221716 its reverse (61712222), we get a palindrome (83933938).

The spelling of 22221716 in words is "twenty-two million, two hundred twenty-one thousand, seven hundred sixteen".