21321143040 has 72 divisors (see below), whose sum is σ = 68094412848. Its totient is φ = 5685637120.

The previous prime is 21321143021. The next prime is 21321143093. The reversal of 21321143040 is 4034112312.

It is a super-2 number, since 2×21321143040² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21321142998 and 21321143016.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2772351 + ... + 2780030.

It is an arithmetic number, because the mean of its divisors is an integer number (945755734).

Almost surely, 2^21321143040 is an apocalyptic number.

21321143040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21321143040 is an abundant number, since it is smaller than the sum of its proper divisors (46773269808).

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

21321143040 is an equidigital number, since it uses as much as digits as its factorization.

21321143040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5552405 (or 5552391 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21321143040 its reverse (4034112312), we get a palindrome (25355255352).

The spelling of 21321143040 in words is "twenty-one billion, three hundred twenty-one million, one hundred forty-three thousand, forty".