21444104513420 has 12 divisors (see below), whose sum is σ = 45032619478224. Its totient is φ = 8577641805360.

The previous prime is 21444104513389. The next prime is 21444104513443. The reversal of 21444104513420 is 2431540144412.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 536102612816 + ... + 536102612855.

It is an arithmetic number, because the mean of its divisors is an integer number (3752718289852).

Almost surely, 2^{21444104513420} is an apocalyptic number.

21444104513420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21444104513420 is an abundant number, since it is smaller than the sum of its proper divisors (23588514964804).

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

21444104513420 is a wasteful number, since it uses less digits than its factorization.

21444104513420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072205225680 (or 1072205225678 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 35.

Adding to 21444104513420 its reverse (2431540144412), we get a palindrome (23875644657832).

The spelling of 21444104513420 in words is "twenty-one trillion, four hundred forty-four billion, one hundred four million, five hundred thirteen thousand, four hundred twenty".