221203133231 has 4 divisors (see below), whose sum is σ = 222560207832. Its totient is φ = 219846058632.

The previous prime is 221203133227. The next prime is 221203133267. The reversal of 221203133231 is 132331302122.

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 221203133231 - 2² = 221203133227 is a prime.

It is a super-3 number, since 3×221203133231³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221203133197 and 221203133206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221203133201) 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, 678537056 + ... + 678537381.

It is an arithmetic number, because the mean of its divisors is an integer number (55640051958).

Almost surely, 2^221203133231 is an apocalyptic number.

221203133231 is a deficient number, since it is larger than the sum of its proper divisors (1357074601).

221203133231 is a wasteful number, since it uses less digits than its factorization.

221203133231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357074600.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 221203133231 its reverse (132331302122), we get a palindrome (353534435353).

The spelling of 221203133231 in words is "two hundred twenty-one billion, two hundred three million, one hundred thirty-three thousand, two hundred thirty-one".