21100233101 has 4 divisors (see below), whose sum is σ = 21141687900. Its totient is φ = 21058778304.

The previous prime is 21100233061. The next prime is 21100233103. The reversal of 21100233101 is 10133200112.

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 10357947076 + 10742286025 = 101774^2 + 103645^2 .

It is a cyclic number.

It is not a de Polignac number, because 21100233101 - 2²⁶ = 21033124237 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 (21100233103) 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, 20726636 + ... + 20727653.

It is an arithmetic number, because the mean of its divisors is an integer number (5285421975).

Almost surely, 2^21100233101 is an apocalyptic number.

It is an amenable number.

21100233101 is a deficient number, since it is larger than the sum of its proper divisors (41454799).

21100233101 is an equidigital number, since it uses as much as digits as its factorization.

21100233101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41454798.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21100233101 its reverse (10133200112), we get a palindrome (31233433213).

The spelling of 21100233101 in words is "twenty-one billion, one hundred million, two hundred thirty-three thousand, one hundred one".