21143332444340 has 12 divisors (see below), whose sum is σ = 44400998133156. Its totient is φ = 8457332977728.

The previous prime is 21143332444313. The next prime is 21143332444343. The reversal of 21143332444340 is 4344423334112.

It can be written as a sum of positive squares in 2 ways, for example, as 15295263959056 + 5848068485284 = 3910916^2 + 2418278^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21143332444294 and 21143332444303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21143332444343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 528583311089 + ... + 528583311128.

It is an arithmetic number, because the mean of its divisors is an integer number (3700083177763).

Almost surely, 2^{21143332444340} is an apocalyptic number.

21143332444340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21143332444340 is an abundant number, since it is smaller than the sum of its proper divisors (23257665688816).

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

21143332444340 is a wasteful number, since it uses less digits than its factorization.

21143332444340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1057166622226 (or 1057166622224 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 38.

Adding to 21143332444340 its reverse (4344423334112), we get a palindrome (25487755778452).

The spelling of 21143332444340 in words is "twenty-one trillion, one hundred forty-three billion, three hundred thirty-two million, four hundred forty-four thousand, three hundred forty".