221311121343131 has 4 divisors (see below), whose sum is σ = 221311192940064. Its totient is φ = 221311049746200.

The previous prime is 221311121343107. The next prime is 221311121343133. The reversal of 221311121343131 is 131343121113122.

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 221311121343131 - 2¹⁰ = 221311121342107 is a prime.

It is a super-2 number, since 2×221311121343131² (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 = 221311121343094 and 221311121343103.

It is not an unprimeable number, because it can be changed into a prime (221311121343133) 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 3 ways as a sum of consecutive naturals, for example, 30942275 + ... + 37417196.

It is an arithmetic number, because the mean of its divisors is an integer number (55327798235016).

Almost surely, 2^{221311121343131} is an apocalyptic number.

221311121343131 is a deficient number, since it is larger than the sum of its proper divisors (71596933).

221311121343131 is an equidigital number, since it uses as much as digits as its factorization.

221311121343131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71596932.

The product of its digits is 2592, while the sum is 29.

Adding to 221311121343131 its reverse (131343121113122), we get a palindrome (352654242456253).

The spelling of 221311121343131 in words is "two hundred twenty-one trillion, three hundred eleven billion, one hundred twenty-one million, three hundred forty-three thousand, one hundred thirty-one".