221103134431 has 4 divisors (see below), whose sum is σ = 221182357264. Its totient is φ = 221023911600.

The previous prime is 221103134401. The next prime is 221103134443. The reversal of 221103134431 is 134431301122.

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 221103134431 - 2⁹ = 221103133919 is a prime.

It is a super-2 number, since 2×221103134431² (a number of 23 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 = 221103134396 and 221103134405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221103134401) 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 3 ways as a sum of consecutive naturals, for example, 39607230 + ... + 39612811.

It is an arithmetic number, because the mean of its divisors is an integer number (55295589316).

Almost surely, 2^221103134431 is an apocalyptic number.

221103134431 is a deficient number, since it is larger than the sum of its proper divisors (79222833).

221103134431 is an equidigital number, since it uses as much as digits as its factorization.

221103134431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79222832.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 221103134431 its reverse (134431301122), we get a palindrome (355534435553).

The spelling of 221103134431 in words is "two hundred twenty-one billion, one hundred three million, one hundred thirty-four thousand, four hundred thirty-one".