220301721 has 16 divisors (see below), whose sum is σ = 327017920. Its totient is φ = 146577600.

The previous prime is 220301707. The next prime is 220301743. The reversal of 220301721 is 127103022.

It is not a de Polignac number, because 220301721 - 2⁵ = 220301689 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220301694 and 220301703.

It is not an unprimeable number, because it can be changed into a prime (220301791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6321 + ... + 21921.

It is an arithmetic number, because the mean of its divisors is an integer number (20438620).

Almost surely, 2^220301721 is an apocalyptic number.

It is an amenable number.

220301721 is a deficient number, since it is larger than the sum of its proper divisors (106716199).

220301721 is a wasteful number, since it uses less digits than its factorization.

220301721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16133 (or 16127 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 220301721 is about 14842.5645021337. The cubic root of 220301721 is about 603.9569222453.

Adding to 220301721 its reverse (127103022), we get a palindrome (347404743).

The spelling of 220301721 in words is "two hundred twenty million, three hundred one thousand, seven hundred twenty-one".