2021220321 has 16 divisors (see below), whose sum is σ = 2874325824. Its totient is φ = 1258955264.

The previous prime is 2021220319. The next prime is 2021220329. The reversal of 2021220321 is 1230221202.

It is a happy number.

It is not a de Polignac number, because 2021220321 - 2¹ = 2021220319 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2021220321.

It is not an unprimeable number, because it can be changed into a prime (2021220329) 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 15 ways as a sum of consecutive naturals, for example, 137655 + ... + 151628.

It is an arithmetic number, because the mean of its divisors is an integer number (179645364).

Almost surely, 2^2021220321 is an apocalyptic number.

It is an amenable number.

2021220321 is a deficient number, since it is larger than the sum of its proper divisors (853105503).

2021220321 is a wasteful number, since it uses less digits than its factorization.

2021220321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289440.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 2021220321 is about 44957.9839516854. The cubic root of 2021220321 is about 1264.3613707405.

Adding to 2021220321 its reverse (1230221202), we get a palindrome (3251441523).

The spelling of 2021220321 in words is "two billion, twenty-one million, two hundred twenty thousand, three hundred twenty-one".