21303431140442 has 32 divisors (see below), whose sum is σ = 36721632381120. Its totient is φ = 9167044561920.

The previous prime is 21303431140441. The next prime is 21303431140447. The reversal of 21303431140442 is 24404113430312.

It is a junction number, because it is equal to n+sod(n) for n = 21303431140399 and 21303431140408.

It is not an unprimeable number, because it can be changed into a prime (21303431140441) 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 15 ways as a sum of consecutive naturals, for example, 17985863 + ... + 19133690.

It is an arithmetic number, because the mean of its divisors is an integer number (1147551011910).

Almost surely, 2^{21303431140442} is an apocalyptic number.

21303431140442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21303431140442 is a deficient number, since it is larger than the sum of its proper divisors (15418201240678).

21303431140442 is a wasteful number, since it uses less digits than its factorization.

21303431140442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37120958.

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 21303431140442 its reverse (24404113430312), we get a palindrome (45707544570754).

The spelling of 21303431140442 in words is "twenty-one trillion, three hundred three billion, four hundred thirty-one million, one hundred forty thousand, four hundred forty-two".