21143141344440 has 96 divisors (see below), whose sum is σ = 68740392193200. Its totient is φ = 5636104742400.

The previous prime is 21143141344433. The next prime is 21143141344441. The reversal of 21143141344440 is 4444314134112.

21143141344440 is a `hidden beast` number, since 2 + 1 + 1 + 43 + 141 + 34 + 4 + 440 = 666.

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 = 21143141344395 and 21143141344404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21143141344441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9778086 + ... + 11742965.

Almost surely, 2^{21143141344440} is an apocalyptic number.

21143141344440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21143141344440 is an abundant number, since it is smaller than the sum of its proper divisors (47597250848760).

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

21143141344440 is a wasteful number, since it uses less digits than its factorization.

21143141344440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21523797 (or 21523790 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 36.

Adding to 21143141344440 its reverse (4444314134112), we get a palindrome (25587455478552).

The spelling of 21143141344440 in words is "twenty-one trillion, one hundred forty-three billion, one hundred forty-one million, three hundred forty-four thousand, four hundred forty".