2021013321 has 4 divisors (see below), whose sum is σ = 2694684432. Its totient is φ = 1347342212.

The previous prime is 2021013311. The next prime is 2021013343. The reversal of 2021013321 is 1233101202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2021013321 - 2⁹ = 2021012809 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2021013321.

It is not an unprimeable number, because it can be changed into a prime (2021013311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 336835551 + ... + 336835556.

It is an arithmetic number, because the mean of its divisors is an integer number (673671108).

Almost surely, 2^2021013321 is an apocalyptic number.

It is an amenable number.

2021013321 is a deficient number, since it is larger than the sum of its proper divisors (673671111).

2021013321 is an equidigital number, since it uses as much as digits as its factorization.

2021013321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673671110.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 2021013321 is about 44955.6817432458. The cubic root of 2021013321 is about 1264.3182067608.

Adding to 2021013321 its reverse (1233101202), we get a palindrome (3254114523).

The spelling of 2021013321 in words is "two billion, twenty-one million, thirteen thousand, three hundred twenty-one".