201213212221 has 8 divisors (see below), whose sum is σ = 229961409920. Its totient is φ = 172465877808.

The previous prime is 201213212203. The next prime is 201213212251. The reversal of 201213212221 is 122212312102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 201213212221 - 2¹³ = 201213204029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201213212251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 401275 + ... + 750631.

It is an arithmetic number, because the mean of its divisors is an integer number (28745176240).

Almost surely, 2^201213212221 is an apocalyptic number.

It is an amenable number.

201213212221 is a deficient number, since it is larger than the sum of its proper divisors (28748197699).

201213212221 is an equidigital number, since it uses as much as digits as its factorization.

201213212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431643.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 201213212221 its reverse (122212312102), we get a palindrome (323425524323).

The spelling of 201213212221 in words is "two hundred one billion, two hundred thirteen million, two hundred twelve thousand, two hundred twenty-one".