2142221321 has 4 divisors (see below), whose sum is σ = 2147874000. Its totient is φ = 2136568644.

The previous prime is 2142221297. The next prime is 2142221353. The reversal of 2142221321 is 1231222412.

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 2142221321 - 2¹⁴ = 2142204937 is a prime.

It is a super-2 number, since 2×2142221321² = 9178224376293970082, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2142221293 and 2142221302.

It is not an unprimeable number, because it can be changed into a prime (2142221371) 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 3 ways as a sum of consecutive naturals, for example, 2825771 + ... + 2826528.

It is an arithmetic number, because the mean of its divisors is an integer number (536968500).

Almost surely, 2^2142221321 is an apocalyptic number.

It is an amenable number.

2142221321 is a deficient number, since it is larger than the sum of its proper divisors (5652679).

2142221321 is an equidigital number, since it uses as much as digits as its factorization.

2142221321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5652678.

The product of its digits is 384, while the sum is 20.

The square root of 2142221321 is about 46284.1368181367. The cubic root of 2142221321 is about 1289.1044644834.

Adding to 2142221321 its reverse (1231222412), we get a palindrome (3373443733).

The spelling of 2142221321 in words is "two billion, one hundred forty-two million, two hundred twenty-one thousand, three hundred twenty-one".