21321110221203 has 16 divisors (see below), whose sum is σ = 30618025786880. Its totient is φ = 13119355374624.

The previous prime is 21321110221049. The next prime is 21321110221211. The reversal of 21321110221203 is 30212201112312.

It is a de Polignac number, because none of the positive numbers 2^k-21321110221203 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21321110221203.

It is not an unprimeable number, because it can be changed into a prime (21321110221223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27272923 + ... + 28043796.

It is an arithmetic number, because the mean of its divisors is an integer number (1913626611680).

Almost surely, 2^{21321110221203} is an apocalyptic number.

21321110221203 is a deficient number, since it is larger than the sum of its proper divisors (9296915565677).

21321110221203 is a wasteful number, since it uses less digits than its factorization.

21321110221203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55326618.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21321110221203 its reverse (30212201112312), we get a palindrome (51533311333515).

The spelling of 21321110221203 in words is "twenty-one trillion, three hundred twenty-one billion, one hundred ten million, two hundred twenty-one thousand, two hundred three".