21033311020021 has 8 divisors (see below), whose sum is σ = 22486783685184. Its totient is φ = 19603862696640.

The previous prime is 21033311020019. The next prime is 21033311020027. The reversal of 21033311020021 is 12002011333012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21033311020021 - 2¹ = 21033311020019 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 (21033311020027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6006083635 + ... + 6006087136.

It is an arithmetic number, because the mean of its divisors is an integer number (2810847960648).

Almost surely, 2^{21033311020021} is an apocalyptic number.

It is an amenable number.

21033311020021 is a deficient number, since it is larger than the sum of its proper divisors (1453472665163).

21033311020021 is a wasteful number, since it uses less digits than its factorization.

21033311020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12012170891.

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

Adding to 21033311020021 its reverse (12002011333012), we get a palindrome (33035322353033).

The spelling of 21033311020021 in words is "twenty-one trillion, thirty-three billion, three hundred eleven million, twenty thousand, twenty-one".