221011220212 has 12 divisors (see below), whose sum is σ = 386879631460. Its totient is φ = 110474182656.

The previous prime is 221011220191. The next prime is 221011220239. The reversal of 221011220212 is 212022110122.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 131512121316 + 89499098896 = 362646^2 + 299164^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7841037 + ... + 7869172.

Almost surely, 2^221011220212 is an apocalyptic number.

It is an amenable number.

221011220212 is a deficient number, since it is larger than the sum of its proper divisors (165868411248).

221011220212 is a wasteful number, since it uses less digits than its factorization.

221011220212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15713730 (or 15713728 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221011220212 its reverse (212022110122), we get a palindrome (433033330334).

The spelling of 221011220212 in words is "two hundred twenty-one billion, eleven million, two hundred twenty thousand, two hundred twelve".