21221103113 has 6 divisors (see below), whose sum is σ = 24685773066. Its totient is φ = 18189516912.

The previous prime is 21221103109. The next prime is 21221103119. The reversal of 21221103113 is 31130112212.

It can be written as a sum of positive squares in only one way, i.e., 17090855824 + 4130247289 = 130732^2 + 64267^2 .

It is not a de Polignac number, because 21221103113 - 2² = 21221103109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21221103091 and 21221103100.

It is not an unprimeable number, because it can be changed into a prime (21221103119) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 216541820 + ... + 216541917.

It is an arithmetic number, because the mean of its divisors is an integer number (4114295511).

Almost surely, 2^21221103113 is an apocalyptic number.

It is an amenable number.

21221103113 is a deficient number, since it is larger than the sum of its proper divisors (3464669953).

21221103113 is an equidigital number, since it uses as much as digits as its factorization.

21221103113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433083751 (or 433083744 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21221103113 its reverse (31130112212), we get a palindrome (52351215325).

Subtracting 21221103113 from its reverse (31130112212), we obtain a palindrome (9909009099).

The spelling of 21221103113 in words is "twenty-one billion, two hundred twenty-one million, one hundred three thousand, one hundred thirteen".