221211232201212 has 24 divisors (see below), whose sum is σ = 563083136512512. Its totient is φ = 67033706727600.

The previous prime is 221211232201207. The next prime is 221211232201273. The reversal of 221211232201212 is 212102232112122.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 837921333964 + ... + 837921334227.

It is an arithmetic number, because the mean of its divisors is an integer number (23461797354688).

Almost surely, 2^{221211232201212} is an apocalyptic number.

221211232201212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221211232201212 is an abundant number, since it is smaller than the sum of its proper divisors (341871904311300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221211232201212 is a wasteful number, since it uses less digits than its factorization.

221211232201212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1675842668209 (or 1675842668207 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

Adding to 221211232201212 its reverse (212102232112122), we get a palindrome (433313464313334).

The spelling of 221211232201212 in words is "two hundred twenty-one trillion, two hundred eleven billion, two hundred thirty-two million, two hundred one thousand, two hundred twelve".