21313240440020 has 12 divisors (see below), whose sum is σ = 44757804924084. Its totient is φ = 8525296176000.

The previous prime is 21313240439999. The next prime is 21313240440031. The reversal of 21313240440020 is 2004404231312.

It can be written as a sum of positive squares in 2 ways, for example, as 9860579704336 + 11452660735684 = 3140156^2 + 3384178^2 .

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, 532831010981 + ... + 532831011020.

It is an arithmetic number, because the mean of its divisors is an integer number (3729817077007).

Almost surely, 2^{21313240440020} is an apocalyptic number.

21313240440020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21313240440020 is an abundant number, since it is smaller than the sum of its proper divisors (23444564484064).

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

21313240440020 is a wasteful number, since it uses less digits than its factorization.

21313240440020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065662022010 (or 1065662022008 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21313240440020 its reverse (2004404231312), we get a palindrome (23317644671332).

The spelling of 21313240440020 in words is "twenty-one trillion, three hundred thirteen billion, two hundred forty million, four hundred forty thousand, twenty".