220221993 has 4 divisors (see below), whose sum is σ = 293629328. Its totient is φ = 146814660.

The previous prime is 220221983. The next prime is 220221997. The reversal of 220221993 is 399122022.

It is a happy number.

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 not a de Polignac number, because 220221993 - 2⁴ = 220221977 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 220221993.

It is not an unprimeable number, because it can be changed into a prime (220221997) 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, 36703663 + ... + 36703668.

It is an arithmetic number, because the mean of its divisors is an integer number (73407332).

Almost surely, 2^220221993 is an apocalyptic number.

It is an amenable number.

220221993 is a deficient number, since it is larger than the sum of its proper divisors (73407335).

220221993 is an equidigital number, since it uses as much as digits as its factorization.

220221993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73407334.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 220221993 is about 14839.8784698528. The cubic root of 220221993 is about 603.8840553800.

The spelling of 220221993 in words is "two hundred twenty million, two hundred twenty-one thousand, nine hundred ninety-three".