212220001221 has 32 divisors (see below), whose sum is σ = 295593984000. Its totient is φ = 135282363840.

The previous prime is 212220001219. The next prime is 212220001229. The reversal of 212220001221 is 122100022212.

212220001221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 212220001221 - 2¹ = 212220001219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212220001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212220001229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2572980 + ... + 2654178.

It is an arithmetic number, because the mean of its divisors is an integer number (9237312000).

Almost surely, 2^212220001221 is an apocalyptic number.

It is an amenable number.

212220001221 is a deficient number, since it is larger than the sum of its proper divisors (83373982779).

212220001221 is a wasteful number, since it uses less digits than its factorization.

212220001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81569.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 212220001221 its reverse (122100022212), we get a palindrome (334320023433).

The spelling of 212220001221 in words is "two hundred twelve billion, two hundred twenty million, one thousand, two hundred twenty-one".