21221102113 has 4 divisors (see below), whose sum is σ = 21222167940. Its totient is φ = 21220036288.

The previous prime is 21221102087. The next prime is 21221102131. The reversal of 21221102113 is 31120112212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9268490529 + 11952611584 = 96273^2 + 109328^2 .

It is a cyclic number.

It is not a de Polignac number, because 21221102113 - 2¹⁷ = 21220971041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221102143) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 502468 + ... + 543061.

It is an arithmetic number, because the mean of its divisors is an integer number (5305541985).

Almost surely, 2^21221102113 is an apocalyptic number.

It is an amenable number.

21221102113 is a deficient number, since it is larger than the sum of its proper divisors (1065827).

21221102113 is a wasteful number, since it uses less digits than its factorization.

21221102113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065826.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21221102113 its reverse (31120112212), we get a palindrome (52341214325).

The spelling of 21221102113 in words is "twenty-one billion, two hundred twenty-one million, one hundred two thousand, one hundred thirteen".