21444040302220 has 24 divisors (see below), whose sum is σ = 45035035491600. Its totient is φ = 8577130243392.

The previous prime is 21444040302203. The next prime is 21444040302247. The reversal of 21444040302220 is 2220304044412.

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, 30005335 + ... + 30711694.

It is an arithmetic number, because the mean of its divisors is an integer number (1876459812150).

Almost surely, 2^{21444040302220} is an apocalyptic number.

21444040302220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21444040302220 is an abundant number, since it is smaller than the sum of its proper divisors (23590995189380).

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

21444040302220 is a wasteful number, since it uses less digits than its factorization.

21444040302220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60734697 (or 60734695 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 28.

Adding to 21444040302220 its reverse (2220304044412), we get a palindrome (23664344346632).

The spelling of 21444040302220 in words is "twenty-one trillion, four hundred forty-four billion, forty million, three hundred two thousand, two hundred twenty".