21202023321 has 8 divisors (see below), whose sum is σ = 31410404960. Its totient is φ = 14134682196.

The previous prime is 21202023319. The next prime is 21202023329. The reversal of 21202023321 is 12332020212.

It is not a de Polignac number, because 21202023321 - 2¹ = 21202023319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21202023294 and 21202023303.

It is not an unprimeable number, because it can be changed into a prime (21202023329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 392630035 + ... + 392630088.

It is an arithmetic number, because the mean of its divisors is an integer number (3926300620).

Almost surely, 2^21202023321 is an apocalyptic number.

It is an amenable number.

21202023321 is a deficient number, since it is larger than the sum of its proper divisors (10208381639).

21202023321 is an equidigital number, since it uses as much as digits as its factorization.

21202023321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785260132 (or 785260126 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21202023321 its reverse (12332020212), we get a palindrome (33534043533).

The spelling of 21202023321 in words is "twenty-one billion, two hundred two million, twenty-three thousand, three hundred twenty-one".