21403340032 has 36 divisors (see below), whose sum is σ = 44196298020. Its totient is φ = 10332643328.

The previous prime is 21403340009. The next prime is 21403340033. The reversal of 21403340032 is 23004330412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6853190656 + 14550149376 = 82784^2 + 120624^2 .

It is a super-2 number, since 2×21403340032² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21403339985 and 21403340012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21403340033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1434073 + ... + 1448920.

It is an arithmetic number, because the mean of its divisors is an integer number (1227674945).

Almost surely, 2^21403340032 is an apocalyptic number.

It is an amenable number.

21403340032 is an abundant number, since it is smaller than the sum of its proper divisors (22792957988).

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

21403340032 is an equidigital number, since it uses as much as digits as its factorization.

21403340032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2883038 (or 2883024 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 21403340032 its reverse (23004330412), we get a palindrome (44407670444).

The spelling of 21403340032 in words is "twenty-one billion, four hundred three million, three hundred forty thousand, thirty-two".