220117021 has 4 divisors (see below), whose sum is σ = 220751712. Its totient is φ = 219482332.

The previous prime is 220117013. The next prime is 220117039. The reversal of 220117021 is 120711022.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120711022 = 2 ⋅60355511.

It is a cyclic number.

It is not a de Polignac number, because 220117021 - 2³ = 220117013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220116986 and 220117004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220117091) 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, 316825 + ... + 317518.

It is an arithmetic number, because the mean of its divisors is an integer number (55187928).

Almost surely, 2^220117021 is an apocalyptic number.

It is an amenable number.

220117021 is a deficient number, since it is larger than the sum of its proper divisors (634691).

220117021 is an equidigital number, since it uses as much as digits as its factorization.

220117021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634690.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 220117021 is about 14836.3412268659. The cubic root of 220117021 is about 603.7880901059.

Adding to 220117021 its reverse (120711022), we get a palindrome (340828043).

The spelling of 220117021 in words is "two hundred twenty million, one hundred seventeen thousand, twenty-one".