21221142421103 has 8 divisors (see below), whose sum is σ = 22777245533088. Its totient is φ = 19699239377664.

The previous prime is 21221142421033. The next prime is 21221142421147. The reversal of 21221142421103 is 30112424112212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21221142421103 - 2²⁰ = 21221141372527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221142321103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8550015851 + ... + 8550018332.

It is an arithmetic number, because the mean of its divisors is an integer number (2847155691636).

Almost surely, 2^{21221142421103} is an apocalyptic number.

21221142421103 is a deficient number, since it is larger than the sum of its proper divisors (1556103111985).

21221142421103 is a wasteful number, since it uses less digits than its factorization.

21221142421103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17100034273.

The product of its (nonzero) digits is 1536, while the sum is 26.

Adding to 21221142421103 its reverse (30112424112212), we get a palindrome (51333566533315).

The spelling of 21221142421103 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred forty-two million, four hundred twenty-one thousand, one hundred three".