21133123232101 has 4 divisors (see below), whose sum is σ = 21133618787500. Its totient is φ = 21132627676704.

The previous prime is 21133123232099. The next prime is 21133123232161. The reversal of 21133123232101 is 10123232133112.

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 14142307911876 + 6990815320225 = 3760626^2 + 2644015^2 .

It is a cyclic number.

It is not a de Polignac number, because 21133123232101 - 2¹ = 21133123232099 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 (21133123232161) 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, 247713726 + ... + 247799023.

It is an arithmetic number, because the mean of its divisors is an integer number (5283404696875).

Almost surely, 2^{21133123232101} is an apocalyptic number.

It is an amenable number.

21133123232101 is a deficient number, since it is larger than the sum of its proper divisors (495555399).

21133123232101 is an equidigital number, since it uses as much as digits as its factorization.

21133123232101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495555398.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 21133123232101 its reverse (10123232133112), we get a palindrome (31256355365213).

The spelling of 21133123232101 in words is "twenty-one trillion, one hundred thirty-three billion, one hundred twenty-three million, two hundred thirty-two thousand, one hundred one".