21003440265332 has 144 divisors (see below), whose sum is σ = 45432939460608. Its totient is φ = 8466597511680.

The previous prime is 21003440265263. The next prime is 21003440265337. The reversal of 21003440265332 is 23356204430012.

It is a happy number.

It is a super-2 number, since 2×21003440265332² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21003440265292 and 21003440265301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003440265337) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2145173357 + ... + 2145183147.

It is an arithmetic number, because the mean of its divisors is an integer number (315506524032).

Almost surely, 2^{21003440265332} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21003440265332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22716469730304).

21003440265332 is an abundant number, since it is smaller than the sum of its proper divisors (24429499195276).

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

21003440265332 is an equidigital number, since it uses as much as digits as its factorization.

21003440265332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11724 (or 11694 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 35.

Adding to 21003440265332 its reverse (23356204430012), we get a palindrome (44359644695344).

The spelling of 21003440265332 in words is "twenty-one trillion, three billion, four hundred forty million, two hundred sixty-five thousand, three hundred thirty-two".