21431041042240 has 28 divisors (see below), whose sum is σ = 51032666482596. Its totient is φ = 8572416416768.

The previous prime is 21431041042123. The next prime is 21431041042267. The reversal of 21431041042240 is 4224014013412.

It can be written as a sum of positive squares in 2 ways, for example, as 7496468769024 + 13934572273216 = 2737968^2 + 3732904^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21431041042199 and 21431041042208.

It is a congruent number.

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, 33486001309 + ... + 33486001948.

Almost surely, 2^{21431041042240} is an apocalyptic number.

21431041042240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21431041042240 is an abundant number, since it is smaller than the sum of its proper divisors (29601625440356).

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

21431041042240 is an equidigital number, since it uses as much as digits as its factorization.

21431041042240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66972003274 (or 66972003264 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 21431041042240 its reverse (4224014013412), we get a palindrome (25655055055652).

The spelling of 21431041042240 in words is "twenty-one trillion, four hundred thirty-one billion, forty-one million, forty-two thousand, two hundred forty".