21011020332133 has 4 divisors (see below), whose sum is σ = 22627252665388. Its totient is φ = 19394787998880.

The previous prime is 21011020332119. The next prime is 21011020332191. The reversal of 21011020332133 is 33123302011012.

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 1566157137444 + 19444863194689 = 1251462^2 + 4409633^2 .

It is a cyclic number.

It is not a de Polignac number, because 21011020332133 - 2⁹ = 21011020331621 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 (21011020332103) 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, 808116166608 + ... + 808116166633.

It is an arithmetic number, because the mean of its divisors is an integer number (5656813166347).

Almost surely, 2^{21011020332133} is an apocalyptic number.

It is an amenable number.

21011020332133 is a deficient number, since it is larger than the sum of its proper divisors (1616232333255).

21011020332133 is a wasteful number, since it uses less digits than its factorization.

21011020332133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1616232333254.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 21011020332133 its reverse (33123302011012), we get a palindrome (54134322343145).

The spelling of 21011020332133 in words is "twenty-one trillion, eleven billion, twenty million, three hundred thirty-two thousand, one hundred thirty-three".