221312110213231 has 8 divisors (see below), whose sum is σ = 224409941798144. Its totient is φ = 218216066705280.

The previous prime is 221312110213213. The next prime is 221312110213283. The reversal of 221312110213231 is 132312011213122.

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 221312110213231 - 2⁵ = 221312110213199 is a prime.

It is a super-2 number, since 2×221312110213231² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221312110213196 and 221312110213205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221312110213631) 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, 446769966 + ... + 447265051.

It is an arithmetic number, because the mean of its divisors is an integer number (28051242724768).

Almost surely, 2^{221312110213231} is an apocalyptic number.

221312110213231 is a deficient number, since it is larger than the sum of its proper divisors (3097831584913).

221312110213231 is an equidigital number, since it uses as much as digits as its factorization.

221312110213231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894038481.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 221312110213231 its reverse (132312011213122), we get a palindrome (353624121426353).

The spelling of 221312110213231 in words is "two hundred twenty-one trillion, three hundred twelve billion, one hundred ten million, two hundred thirteen thousand, two hundred thirty-one".