22421443440 has 80 divisors (see below), whose sum is σ = 75825254016. Its totient is φ = 5435500800.

The previous prime is 22421443399. The next prime is 22421443489. The reversal of 22421443440 is 4434412422.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×22421443440² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 22421443398 and 22421443407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4243846 + ... + 4249125.

Almost surely, 2^22421443440 is an apocalyptic number.

22421443440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22421443440 is an abundant number, since it is smaller than the sum of its proper divisors (53403810576).

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

22421443440 is a wasteful number, since it uses less digits than its factorization.

22421443440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8492998 (or 8492992 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 30.

Adding to 22421443440 its reverse (4434412422), we get a palindrome (26855855862).

The spelling of 22421443440 in words is "twenty-two billion, four hundred twenty-one million, four hundred forty-three thousand, four hundred forty".