21420111303 has 12 divisors (see below), whose sum is σ = 31598462688. Its totient is φ = 13976242560.

The previous prime is 21420111241. The next prime is 21420111319. The reversal of 21420111303 is 30311102412.

It is not a de Polignac number, because 21420111303 - 2⁶ = 21420111239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21420111343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25318858 + ... + 25319703.

It is an arithmetic number, because the mean of its divisors is an integer number (2633205224).

Almost surely, 2^21420111303 is an apocalyptic number.

21420111303 is a deficient number, since it is larger than the sum of its proper divisors (10178351385).

21420111303 is a wasteful number, since it uses less digits than its factorization.

21420111303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50638614 (or 50638611 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21420111303 its reverse (30311102412), we get a palindrome (51731213715).

The spelling of 21420111303 in words is "twenty-one billion, four hundred twenty million, one hundred eleven thousand, three hundred three".