21101223133 has 4 divisors (see below), whose sum is σ = 21101609308. Its totient is φ = 21100836960.

The previous prime is 21101223131. The next prime is 21101223193. The reversal of 21101223133 is 33132210112.

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 7594599609 + 13506623524 = 87147^2 + 116218^2 .

It is a cyclic number.

It is not a de Polignac number, because 21101223133 - 2¹ = 21101223131 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 21101223133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101223131) 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, 94266 + ... + 226027.

It is an arithmetic number, because the mean of its divisors is an integer number (5275402327).

Almost surely, 2^21101223133 is an apocalyptic number.

It is an amenable number.

21101223133 is a deficient number, since it is larger than the sum of its proper divisors (386175).

21101223133 is an equidigital number, since it uses as much as digits as its factorization.

21101223133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386174.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21101223133 its reverse (33132210112), we get a palindrome (54233433245).

The spelling of 21101223133 in words is "twenty-one billion, one hundred one million, two hundred twenty-three thousand, one hundred thirty-three".