21326412040 has 16 divisors (see below), whose sum is σ = 47984427180. Its totient is φ = 8530564800.

The previous prime is 21326412011. The next prime is 21326412047. The reversal of 21326412040 is 4021462312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19869157764 + 1457254276 = 140958^2 + 38174^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21326411996 and 21326412014.

It is not an unprimeable number, because it can be changed into a prime (21326412047) 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, 266580111 + ... + 266580190.

Almost surely, 2^21326412040 is an apocalyptic number.

21326412040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21326412040 is an abundant number, since it is smaller than the sum of its proper divisors (26658015140).

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

21326412040 is a wasteful number, since it uses less digits than its factorization.

21326412040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533160312 (or 533160308 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21326412040 its reverse (4021462312), we get a palindrome (25347874352).

The spelling of 21326412040 in words is "twenty-one billion, three hundred twenty-six million, four hundred twelve thousand, forty".