21331300220021 has 8 divisors (see below), whose sum is σ = 23270598172800. Its totient is φ = 19392017074240.

The previous prime is 21331300220017. The next prime is 21331300220051. The reversal of 21331300220021 is 12002200313312.

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

It is a cyclic number.

It is not a de Polignac number, because 21331300220021 - 2² = 21331300220017 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21331300219975 and 21331300220002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331300220051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 574676 + ... + 6556893.

It is an arithmetic number, because the mean of its divisors is an integer number (2908824771600).

Almost surely, 2^{21331300220021} is an apocalyptic number.

It is an amenable number.

21331300220021 is a deficient number, since it is larger than the sum of its proper divisors (1939297952779).

21331300220021 is a wasteful number, since it uses less digits than its factorization.

21331300220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7403499.

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

Adding to 21331300220021 its reverse (12002200313312), we get a palindrome (33333500533333).

The spelling of 21331300220021 in words is "twenty-one trillion, three hundred thirty-one billion, three hundred million, two hundred twenty thousand, twenty-one".