21446544240 has 120 divisors (see below), whose sum is σ = 78572368368. Its totient is φ = 5199160320.

The previous prime is 21446544239. The next prime is 21446544257. The reversal of 21446544240 is 4244564412.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 21446544195 and 21446544204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1346029 + ... + 1361868.

Almost surely, 2^21446544240 is an apocalyptic number.

21446544240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21446544240 is an abundant number, since it is smaller than the sum of its proper divisors (57125824128).

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

21446544240 is a wasteful number, since it uses less digits than its factorization.

21446544240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2707927 (or 2707918 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 36.

The spelling of 21446544240 in words is "twenty-one billion, four hundred forty-six million, five hundred forty-four thousand, two hundred forty".