2021003321 has 8 divisors (see below), whose sum is σ = 2050174440. Its totient is φ = 1991872512.

The previous prime is 2021003291. The next prime is 2021003339. The reversal of 2021003321 is 1233001202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 194295721 + 1826707600 = 13939^2 + 42740^2 .

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 2021003321 - 2¹⁰ = 2021002297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021003296 and 2021003305.

It is not an unprimeable number, because it can be changed into a prime (2021003351) 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, 99401 + ... + 117993.

It is an arithmetic number, because the mean of its divisors is an integer number (256271805).

Almost surely, 2^2021003321 is an apocalyptic number.

It is an amenable number.

2021003321 is a deficient number, since it is larger than the sum of its proper divisors (29171119).

2021003321 is a wasteful number, since it uses less digits than its factorization.

2021003321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20155.

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

The square root of 2021003321 is about 44955.5705224614. The cubic root of 2021003321 is about 1264.3161214698.

Adding to 2021003321 its reverse (1233001202), we get a palindrome (3254004523).

The spelling of 2021003321 in words is "two billion, twenty-one million, three thousand, three hundred twenty-one".