22221760 has 112 divisors (see below), whose sum is σ = 59253120. Its totient is φ = 7869440.

The previous prime is 22221757. The next prime is 22221767. The reversal of 22221760 is 6712222.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221767) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207627 + ... + 207733.

Almost surely, 2^22221760 is an apocalyptic number.

22221760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22221760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29626560).

22221760 is an abundant number, since it is smaller than the sum of its proper divisors (37031360).

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

22221760 is a wasteful number, since it uses less digits than its factorization.

22221760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194 (or 184 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 22221760 is about 4713.9961815852. The cubic root of 22221760 is about 281.1422724871.

Adding to 22221760 its reverse (6712222), we get a palindrome (28933982).

The spelling of 22221760 in words is "twenty-two million, two hundred twenty-one thousand, seven hundred sixty".