221100231231 has 32 divisors (see below), whose sum is σ = 357711494400. Its totient is φ = 133858470240.

The previous prime is 221100231227. The next prime is 221100231239. The reversal of 221100231231 is 132132001122.

221100231231 is a `hidden beast` number, since 221 + 100 + 2 + 312 + 31 = 666.

It is not a de Polignac number, because 221100231231 - 2² = 221100231227 is a prime.

It is a super-2 number, since 2×221100231231² (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 (221100231239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 111796 + ... + 674313.

It is an arithmetic number, because the mean of its divisors is an integer number (11178484200).

Almost surely, 2^221100231231 is an apocalyptic number.

221100231231 is a deficient number, since it is larger than the sum of its proper divisors (136611263169).

221100231231 is a wasteful number, since it uses less digits than its factorization.

221100231231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787076 (or 787070 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 221100231231 its reverse (132132001122), we get a palindrome (353232232353).

The spelling of 221100231231 in words is "two hundred twenty-one billion, one hundred million, two hundred thirty-one thousand, two hundred thirty-one".