320002121021 has 12 divisors (see below), whose sum is σ = 357815382432. Its totient is φ = 283815612000.

The previous prime is 320002120993. The next prime is 320002121167. The reversal of 320002121021 is 120121200023.

It is a happy number.

It is not a de Polignac number, because 320002121021 - 2¹⁴ = 320002104637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 320002120987 and 320002121005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320002121521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8634425 + ... + 8671406.

It is an arithmetic number, because the mean of its divisors is an integer number (29817948536).

Almost surely, 2^320002121021 is an apocalyptic number.

It is an amenable number.

320002121021 is a deficient number, since it is larger than the sum of its proper divisors (37813261411).

320002121021 is a wasteful number, since it uses less digits than its factorization.

320002121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17305924 (or 17305883 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 320002121021 its reverse (120121200023), we get a palindrome (440123321044).

The spelling of 320002121021 in words is "three hundred twenty billion, two million, one hundred twenty-one thousand, twenty-one".