21243110442 has 16 divisors (see below), whose sum is σ = 42489643392. Its totient is φ = 7080466400.

The previous prime is 21243110423. The next prime is 21243110459. The reversal of 21243110442 is 24401134212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58059 + ... + 214142.

It is an arithmetic number, because the mean of its divisors is an integer number (2655602712).

Almost surely, 2^21243110442 is an apocalyptic number.

21243110442 is an abundant number, since it is smaller than the sum of its proper divisors (21246532950).

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

21243110442 is a wasteful number, since it uses less digits than its factorization.

21243110442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285213.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21243110442 its reverse (24401134212), we get a palindrome (45644244654).

The spelling of 21243110442 in words is "twenty-one billion, two hundred forty-three million, one hundred ten thousand, four hundred forty-two".