220131221 has 8 divisors (see below), whose sum is σ = 226537344. Its totient is φ = 213796960.

The previous prime is 220131211. The next prime is 220131227. The reversal of 220131221 is 122131022.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 220131221 - 2¹⁴ = 220114837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 220131196 and 220131205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220131227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11720 + ... + 24033.

It is an arithmetic number, because the mean of its divisors is an integer number (28317168).

Almost surely, 2^220131221 is an apocalyptic number.

It is an amenable number.

220131221 is a deficient number, since it is larger than the sum of its proper divisors (6406123).

220131221 is a wasteful number, since it uses less digits than its factorization.

220131221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35931.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 220131221 is about 14836.8197737925. The cubic root of 220131221 is about 603.8010735127.

Adding to 220131221 its reverse (122131022), we get a palindrome (342262243).

The spelling of 220131221 in words is "two hundred twenty million, one hundred thirty-one thousand, two hundred twenty-one".