21222440240 has 40 divisors (see below), whose sum is σ = 49359952368. Its totient is φ = 8485917440.

The previous prime is 21222440221. The next prime is 21222440273. The reversal of 21222440240 is 4204422212.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182519 + ... + 275241.

Almost surely, 2^21222440240 is an apocalyptic number.

21222440240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222440240 is an abundant number, since it is smaller than the sum of its proper divisors (28137512128).

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

21222440240 is a wasteful number, since it uses less digits than its factorization.

21222440240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95597 (or 95591 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 21222440240 its reverse (4204422212), we get a palindrome (25426862452).

The spelling of 21222440240 in words is "twenty-one billion, two hundred twenty-two million, four hundred forty thousand, two hundred forty".