220142321 has 4 divisors (see below), whose sum is σ = 251591232. Its totient is φ = 188693412.

The previous prime is 220142297. The next prime is 220142339. The reversal of 220142321 is 123241022.

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 220142321 - 2¹⁴ = 220125937 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 220142321.

It is not an unprimeable number, because it can be changed into a prime (220142521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15724445 + ... + 15724458.

It is an arithmetic number, because the mean of its divisors is an integer number (62897808).

Almost surely, 2^220142321 is an apocalyptic number.

It is an amenable number.

220142321 is a deficient number, since it is larger than the sum of its proper divisors (31448911).

220142321 is an equidigital number, since it uses as much as digits as its factorization.

220142321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31448910.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 220142321 is about 14837.1938384588. The cubic root of 220142321 is about 603.8112221251.

Adding to 220142321 its reverse (123241022), we get a palindrome (343383343).

The spelling of 220142321 in words is "two hundred twenty million, one hundred forty-two thousand, three hundred twenty-one".