21103421043142 has 32 divisors (see below), whose sum is σ = 33235252300800. Its totient is φ = 10030776563808.

The previous prime is 21103421043101. The next prime is 21103421043163. The reversal of 21103421043142 is 24134012430112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21103421043142.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7060959 + ... + 9594997.

It is an arithmetic number, because the mean of its divisors is an integer number (1038601634400).

Almost surely, 2^{21103421043142} is an apocalyptic number.

21103421043142 is a deficient number, since it is larger than the sum of its proper divisors (12131831257658).

21103421043142 is a wasteful number, since it uses less digits than its factorization.

21103421043142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2535180.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 21103421043142 its reverse (24134012430112), we get a palindrome (45237433473254).

The spelling of 21103421043142 in words is "twenty-one trillion, one hundred three billion, four hundred twenty-one million, forty-three thousand, one hundred forty-two".