21443503432040 has 32 divisors (see below), whose sum is σ = 48248365663080. Its totient is φ = 8577315516672.

The previous prime is 21443503432037. The next prime is 21443503432049. The reversal of 21443503432040 is 4023430534412.

It can be written as a sum of positive squares in 4 ways, for example, as 18716335232644 + 2727168199396 = 4326238^2 + 1651414^2 .

It is a super-2 number, since 2×21443503432040² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21443503432049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1441394 + ... + 6705566.

Almost surely, 2^{21443503432040} is an apocalyptic number.

21443503432040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21443503432040 is an abundant number, since it is smaller than the sum of its proper divisors (26804862231040).

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

21443503432040 is a wasteful number, since it uses less digits than its factorization.

21443503432040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5366021 (or 5366017 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 35.

Adding to 21443503432040 its reverse (4023430534412), we get a palindrome (25466933966452).

The spelling of 21443503432040 in words is "twenty-one trillion, four hundred forty-three billion, five hundred three million, four hundred thirty-two thousand, forty".