22218943440 has 40 divisors (see below), whose sum is σ = 68878725408. Its totient is φ = 5925051520.

The previous prime is 22218943423. The next prime is 22218943447. The reversal of 22218943440 is 4434981222.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22218943447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46289226 + ... + 46289705.

Almost surely, 2^22218943440 is an apocalyptic number.

22218943440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22218943440 is an abundant number, since it is smaller than the sum of its proper divisors (46659781968).

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

22218943440 is a wasteful number, since it uses less digits than its factorization.

22218943440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92578947 (or 92578941 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 39.

The spelling of 22218943440 in words is "twenty-two billion, two hundred eighteen million, nine hundred forty-three thousand, four hundred forty".