221111220231 has 48 divisors (see below), whose sum is σ = 370134955008. Its totient is φ = 130738276800.

The previous prime is 221111220223. The next prime is 221111220241. The reversal of 221111220231 is 132022111122.

221111220231 is a `hidden beast` number, since 2 + 211 + 1 + 1 + 220 + 231 = 666.

221111220231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221111220231 - 2³ = 221111220223 is a prime.

It is a super-2 number, since 2×221111220231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221111220221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 899191 + ... + 1118376.

It is an arithmetic number, because the mean of its divisors is an integer number (7711144896).

Almost surely, 2^221111220231 is an apocalyptic number.

221111220231 is a deficient number, since it is larger than the sum of its proper divisors (149023734777).

221111220231 is a wasteful number, since it uses less digits than its factorization.

221111220231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2017634 (or 2017622 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 221111220231 its reverse (132022111122), we get a palindrome (353133331353).

The spelling of 221111220231 in words is "two hundred twenty-one billion, one hundred eleven million, two hundred twenty thousand, two hundred thirty-one".