20321030021 has 8 divisors (see below), whose sum is σ = 20571438720. Its totient is φ = 20070754272.

The previous prime is 20321030011. The next prime is 20321030047. The reversal of 20321030021 is 12003012302.

It is a happy number.

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 20321030021 - 2¹⁰ = 20321028997 is a prime.

It is a super-2 number, since 2×20321030021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20321029978 and 20321030005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321030011) 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, 294041 + ... + 356513.

It is an arithmetic number, because the mean of its divisors is an integer number (2571429840).

Almost surely, 2^20321030021 is an apocalyptic number.

It is an amenable number.

20321030021 is a deficient number, since it is larger than the sum of its proper divisors (250408699).

20321030021 is an equidigital number, since it uses as much as digits as its factorization.

20321030021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66475.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 20321030021 its reverse (12003012302), we get a palindrome (32324042323).

The spelling of 20321030021 in words is "twenty billion, three hundred twenty-one million, thirty thousand, twenty-one".