21330332021 has 8 divisors (see below), whose sum is σ = 22703307264. Its totient is φ = 19970495680.

The previous prime is 21330332011. The next prime is 21330332029. The reversal of 21330332021 is 12023303312.

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

It is not a de Polignac number, because 21330332021 - 2¹⁰ = 21330330997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21330331984 and 21330332002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330332029) 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, 3281375 + ... + 3287868.

It is an arithmetic number, because the mean of its divisors is an integer number (2837913408).

Almost surely, 2^21330332021 is an apocalyptic number.

It is an amenable number.

21330332021 is a deficient number, since it is larger than the sum of its proper divisors (1372975243).

21330332021 is a wasteful number, since it uses less digits than its factorization.

21330332021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6569451.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21330332021 its reverse (12023303312), we get a palindrome (33353635333).

The spelling of 21330332021 in words is "twenty-one billion, three hundred thirty million, three hundred thirty-two thousand, twenty-one".