221111212313231 has 4 divisors (see below), whose sum is σ = 221111675685264. Its totient is φ = 221110748941200.

The previous prime is 221111212313219. The next prime is 221111212313239. The reversal of 221111212313231 is 132313212111122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221111212313231 - 2¹⁴ = 221111212296847 is a prime.

It is a super-2 number, since 2×221111212313231² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221111212313231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221111212313239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230969510 + ... + 231924851.

It is an arithmetic number, because the mean of its divisors is an integer number (55277918921316).

Almost surely, 2^{221111212313231} is an apocalyptic number.

221111212313231 is a deficient number, since it is larger than the sum of its proper divisors (463372033).

221111212313231 is an equidigital number, since it uses as much as digits as its factorization.

221111212313231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463372032.

The product of its digits is 864, while the sum is 26.

Adding to 221111212313231 its reverse (132313212111122), we get a palindrome (353424424424353).

The spelling of 221111212313231 in words is "two hundred twenty-one trillion, one hundred eleven billion, two hundred twelve million, three hundred thirteen thousand, two hundred thirty-one".