21002021302133 has 4 divisors (see below), whose sum is σ = 21019335418188. Its totient is φ = 20984707186080.

The previous prime is 21002021302117. The next prime is 21002021302177. The reversal of 21002021302133 is 33120312020012.

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 12459156241009 + 8542865061124 = 3529753^2 + 2922818^2 .

It is a cyclic number.

It is not a de Polignac number, because 21002021302133 - 2⁴ = 21002021302117 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 (21002021302733) 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, 8657056208 + ... + 8657058633.

It is an arithmetic number, because the mean of its divisors is an integer number (5254833854547).

Almost surely, 2^{21002021302133} is an apocalyptic number.

It is an amenable number.

21002021302133 is a deficient number, since it is larger than the sum of its proper divisors (17314116055).

21002021302133 is a wasteful number, since it uses less digits than its factorization.

21002021302133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17314116054.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21002021302133 its reverse (33120312020012), we get a palindrome (54122333322145).

The spelling of 21002021302133 in words is "twenty-one trillion, two billion, twenty-one million, three hundred two thousand, one hundred thirty-three".