220021331 has 4 divisors (see below), whose sum is σ = 221338992. Its totient is φ = 218703672.

The previous prime is 220021313. The next prime is 220021337. The reversal of 220021331 is 133120022.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 220021331 - 2⁶ = 220021267 is a prime.

It is a super-2 number, since 2×220021331² = 96818772190023122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220021337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 658580 + ... + 658913.

It is an arithmetic number, because the mean of its divisors is an integer number (55334748).

Almost surely, 2^220021331 is an apocalyptic number.

220021331 is a deficient number, since it is larger than the sum of its proper divisors (1317661).

220021331 is a wasteful number, since it uses less digits than its factorization.

220021331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1317660.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 220021331 is about 14833.1160246254. The cubic root of 220021331 is about 603.7005838386.

Adding to 220021331 its reverse (133120022), we get a palindrome (353141353).

The spelling of 220021331 in words is "two hundred twenty million, twenty-one thousand, three hundred thirty-one".