21000212020133 has 4 divisors (see below), whose sum is σ = 21000793183980. Its totient is φ = 20999630856288.

The previous prime is 21000212020127. The next prime is 21000212020141. The reversal of 21000212020133 is 33102021200012.

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 7872474358849 + 13127737661284 = 2805793^2 + 3623222^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000212020133 - 2⁸ = 21000212019877 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 (21000212020933) 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, 290527718 + ... + 290599991.

It is an arithmetic number, because the mean of its divisors is an integer number (5250198295995).

Almost surely, 2^{21000212020133} is an apocalyptic number.

It is an amenable number.

21000212020133 is a deficient number, since it is larger than the sum of its proper divisors (581163847).

21000212020133 is an equidigital number, since it uses as much as digits as its factorization.

21000212020133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581163846.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21000212020133 its reverse (33102021200012), we get a palindrome (54102233220145).

The spelling of 21000212020133 in words is "twenty-one trillion, two hundred twelve million, twenty thousand, one hundred thirty-three".