22221516 has 24 divisors (see below), whose sum is σ = 54900720. Its totient is φ = 6971392.

The previous prime is 22221491. The next prime is 22221517. The reversal of 22221516 is 61512222.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 22221492 and 22221501.

It is not an unprimeable number, because it can be changed into a prime (22221517) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 54261 + ... + 54668.

It is an arithmetic number, because the mean of its divisors is an integer number (2287530).

Almost surely, 2^22221516 is an apocalyptic number.

It is an amenable number.

22221516 is an abundant number, since it is smaller than the sum of its proper divisors (32679204).

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

22221516 is a wasteful number, since it uses less digits than its factorization.

22221516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108953 (or 108951 counting only the distinct ones).

The product of its digits is 480, while the sum is 21.

The square root of 22221516 is about 4713.9703011368. The cubic root of 22221516 is about 281.1412434812.

Adding to 22221516 its reverse (61512222), we get a palindrome (83733738).

The spelling of 22221516 in words is "twenty-two million, two hundred twenty-one thousand, five hundred sixteen".