21103111221133 has 4 divisors (see below), whose sum is σ = 21110710471740. Its totient is φ = 21095511970528.

The previous prime is 21103111221131. The next prime is 21103111221161. The reversal of 21103111221133 is 33112211130112.

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 1310560171209 + 19792551049924 = 1144797^2 + 4448882^2 .

It is a cyclic number.

It is not a de Polignac number, because 21103111221133 - 2¹ = 21103111221131 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 (21103111221131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3799621138 + ... + 3799626691.

It is an arithmetic number, because the mean of its divisors is an integer number (5277677617935).

Almost surely, 2^{21103111221133} is an apocalyptic number.

It is an amenable number.

21103111221133 is a deficient number, since it is larger than the sum of its proper divisors (7599250607).

21103111221133 is an equidigital number, since it uses as much as digits as its factorization.

21103111221133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7599250606.

The product of its (nonzero) digits is 216, while the sum is 22.

Adding to 21103111221133 its reverse (33112211130112), we get a palindrome (54215322351245).

The spelling of 21103111221133 in words is "twenty-one trillion, one hundred three billion, one hundred eleven million, two hundred twenty-one thousand, one hundred thirty-three".