221212323231 has 16 divisors (see below), whose sum is σ = 308390496000. Its totient is φ = 140780217600.

The previous prime is 221212323187. The next prime is 221212323253. The reversal of 221212323231 is 132323212122.

It is not a de Polignac number, because 221212323231 - 2⁷ = 221212323103 is a prime.

It is a super-2 number, since 2×221212323231² (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 (221212328231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3177970 + ... + 3246831.

It is an arithmetic number, because the mean of its divisors is an integer number (19274406000).

Almost surely, 2^221212323231 is an apocalyptic number.

221212323231 is a deficient number, since it is larger than the sum of its proper divisors (87178172769).

221212323231 is a wasteful number, since it uses less digits than its factorization.

221212323231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6425326.

The product of its digits is 1728, while the sum is 24.

Adding to 221212323231 its reverse (132323212122), we get a palindrome (353535535353).

The spelling of 221212323231 in words is "two hundred twenty-one billion, two hundred twelve million, three hundred twenty-three thousand, two hundred thirty-one".