221201331 has 32 divisors (see below), whose sum is σ = 344171520. Its totient is φ = 125121024.

The previous prime is 221201329. The next prime is 221201333. The reversal of 221201331 is 133102122.

It is an interprime number because it is at equal distance from previous prime (221201329) and next prime (221201333).

It is not a de Polignac number, because 221201331 - 2¹ = 221201329 is a prime.

It is a super-2 number, since 2×221201331² = 97860057672343122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221201331.

It is not an unprimeable number, because it can be changed into a prime (221201333) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24630 + ... + 32388.

It is an arithmetic number, because the mean of its divisors is an integer number (10755360).

Almost surely, 2^221201331 is an apocalyptic number.

221201331 is a deficient number, since it is larger than the sum of its proper divisors (122970189).

221201331 is a wasteful number, since it uses less digits than its factorization.

221201331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7835.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 221201331 is about 14872.8387001272. The cubic root of 221201331 is about 604.7778990316. Note that the first 3 decimals are identical.

Adding to 221201331 its reverse (133102122), we get a palindrome (354303453).

The spelling of 221201331 in words is "two hundred twenty-one million, two hundred one thousand, three hundred thirty-one".