21000012321133 has 2 divisors, whose sum is σ = 21000012321134. Its totient is φ = 21000012321132.

The previous prime is 21000012321109. The next prime is 21000012321161. The reversal of 21000012321133 is 33112321000012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20980229054724 + 19783266409 = 4580418^2 + 140653^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000012321133 - 2⁹ = 21000012320621 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21000012321133.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21000012325133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500006160566 + 10500006160567.

It is an arithmetic number, because the mean of its divisors is an integer number (10500006160567).

Almost surely, 2^{21000012321133} is an apocalyptic number.

It is an amenable number.

21000012321133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000012321133 is an equidigital number, since it uses as much as digits as its factorization.

21000012321133 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21000012321133 its reverse (33112321000012), we get a palindrome (54112333321145).

The spelling of 21000012321133 in words is "twenty-one trillion, twelve million, three hundred twenty-one thousand, one hundred thirty-three".