221213131243 has 4 divisors (see below), whose sum is σ = 238229525968. Its totient is φ = 204196736520.

The previous prime is 221213131241. The next prime is 221213131247. The reversal of 221213131243 is 342131312122.

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 221213131243 - 2¹ = 221213131241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221213131241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8508197343 + ... + 8508197368.

It is an arithmetic number, because the mean of its divisors is an integer number (59557381492).

Almost surely, 2^221213131243 is an apocalyptic number.

221213131243 is a deficient number, since it is larger than the sum of its proper divisors (17016394725).

221213131243 is a wasteful number, since it uses less digits than its factorization.

221213131243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17016394724.

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

Adding to 221213131243 its reverse (342131312122), we get a palindrome (563344443365).

The spelling of 221213131243 in words is "two hundred twenty-one billion, two hundred thirteen million, one hundred thirty-one thousand, two hundred forty-three".