212201231221 has 16 divisors (see below), whose sum is σ = 243119170944. Its totient is φ = 181434711744.

The previous prime is 212201231159. The next prime is 212201231261. The reversal of 212201231221 is 122132102212.

It is a cyclic number.

It is not a de Polignac number, because 212201231221 - 2¹³ = 212201223029 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 (212201231261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4778506 + ... + 4822708.

It is an arithmetic number, because the mean of its divisors is an integer number (15194948184).

Almost surely, 2^212201231221 is an apocalyptic number.

It is an amenable number.

212201231221 is a deficient number, since it is larger than the sum of its proper divisors (30917939723).

212201231221 is a wasteful number, since it uses less digits than its factorization.

212201231221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45900.

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

Adding to 212201231221 its reverse (122132102212), we get a palindrome (334333333433).

The spelling of 212201231221 in words is "two hundred twelve billion, two hundred one million, two hundred thirty-one thousand, two hundred twenty-one".