210221220212 has 12 divisors (see below), whose sum is σ = 387249616320. Its totient is φ = 99578472696.

The previous prime is 210221220203. The next prime is 210221220217. The reversal of 210221220212 is 212022122012.

It is a happy number.

It is a super-2 number, since 2×210221220212² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210221220217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1383034268 + ... + 1383034419.

It is an arithmetic number, because the mean of its divisors is an integer number (32270801360).

Almost surely, 2^210221220212 is an apocalyptic number.

It is an amenable number.

210221220212 is a deficient number, since it is larger than the sum of its proper divisors (177028396108).

210221220212 is a wasteful number, since it uses less digits than its factorization.

210221220212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2766068710 (or 2766068708 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 210221220212 its reverse (212022122012), we get a palindrome (422243342224).

The spelling of 210221220212 in words is "two hundred ten billion, two hundred twenty-one million, two hundred twenty thousand, two hundred twelve".