201220312231 has 4 divisors (see below), whose sum is σ = 211810855000. Its totient is φ = 190629769464.

The previous prime is 201220312217. The next prime is 201220312277. The reversal of 201220312231 is 132213022102.

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 201220312231 - 2⁷ = 201220312103 is a prime.

It is a super-3 number, since 3×201220312231³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 10590542749 = 201220312231 / (2 + 0 + 1 + 2 + 2 + 0 + 3 + 1 + 2 + 2 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201220312199 and 201220312208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201220318231) 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, 5295271356 + ... + 5295271393.

It is an arithmetic number, because the mean of its divisors is an integer number (52952713750).

Almost surely, 2^201220312231 is an apocalyptic number.

201220312231 is a deficient number, since it is larger than the sum of its proper divisors (10590542769).

201220312231 is a wasteful number, since it uses less digits than its factorization.

201220312231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10590542768.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 201220312231 its reverse (132213022102), we get a palindrome (333433334333).

The spelling of 201220312231 in words is "two hundred one billion, two hundred twenty million, three hundred twelve thousand, two hundred thirty-one".