21012133300133 has 4 divisors (see below), whose sum is σ = 21049857058860. Its totient is φ = 20974409541408.

The previous prime is 21012133300129. The next prime is 21012133300139. The reversal of 21012133300133 is 33100333121012.

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 526434411364 + 20485698888769 = 725558^2 + 4526113^2 .

It is a cyclic number.

It is not a de Polignac number, because 21012133300133 - 2² = 21012133300129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21012133300099 and 21012133300108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012133300139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18861878528 + ... + 18861879641.

It is an arithmetic number, because the mean of its divisors is an integer number (5262464264715).

Almost surely, 2^{21012133300133} is an apocalyptic number.

It is an amenable number.

21012133300133 is a deficient number, since it is larger than the sum of its proper divisors (37723758727).

21012133300133 is an equidigital number, since it uses as much as digits as its factorization.

21012133300133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37723758726.

The product of its (nonzero) digits is 972, while the sum is 23.

Adding to 21012133300133 its reverse (33100333121012), we get a palindrome (54112466421145).

The spelling of 21012133300133 in words is "twenty-one trillion, twelve billion, one hundred thirty-three million, three hundred thousand, one hundred thirty-three".