212200001221 has 48 divisors (see below), whose sum is σ = 250688473344. Its totient is φ = 178822705152.

The previous prime is 212200001219. The next prime is 212200001257. The reversal of 212200001221 is 122100002212.

It is a happy number.

It is not a de Polignac number, because 212200001221 - 2¹ = 212200001219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212200001291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15251550 + ... + 15265456.

It is an arithmetic number, because the mean of its divisors is an integer number (5222676528).

Almost surely, 2^212200001221 is an apocalyptic number.

It is an amenable number.

212200001221 is a deficient number, since it is larger than the sum of its proper divisors (38488472123).

212200001221 is a wasteful number, since it uses less digits than its factorization.

212200001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14110 (or 14097 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 212200001221 its reverse (122100002212), we get a palindrome (334300003433).

Subtracting from 212200001221 its reverse (122100002212), we obtain a palindrome (90099999009).

The spelling of 212200001221 in words is "two hundred twelve billion, two hundred million, one thousand, two hundred twenty-one".