22211440 has 20 divisors (see below), whose sum is σ = 51641784. Its totient is φ = 8884544.

The previous prime is 22211429. The next prime is 22211447. The reversal of 22211440 is 4411222.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22211447) 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 3 ways as a sum of consecutive naturals, for example, 138742 + ... + 138901.

Almost surely, 2^22211440 is an apocalyptic number.

22211440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22211440 is an abundant number, since it is smaller than the sum of its proper divisors (29430344).

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

22211440 is a wasteful number, since it uses less digits than its factorization.

22211440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277656 (or 277650 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 22211440 is about 4712.9014417872. The cubic root of 22211440 is about 281.0987440191.

Adding to 22211440 its reverse (4411222), we get a palindrome (26622662).

The spelling of 22211440 in words is "twenty-two million, two hundred eleven thousand, four hundred forty".