212221220101 has 6 divisors (see below), whose sum is σ = 233267952806. Its totient is φ = 192928381800.

The previous prime is 212221220093. The next prime is 212221220177. The reversal of 212221220101 is 101022122212.

It is a happy number.

212221220101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 144571811076 + 67649409025 = 380226^2 + 260095^2 .

It is not a de Polignac number, because 212221220101 - 2³ = 212221220093 is a prime.

It is a super-2 number, since 2×212221220101² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212221220191) 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 5 ways as a sum of consecutive naturals, for example, 876947070 + ... + 876947311.

Almost surely, 2^212221220101 is an apocalyptic number.

It is an amenable number.

212221220101 is a deficient number, since it is larger than the sum of its proper divisors (21046732705).

212221220101 is a wasteful number, since it uses less digits than its factorization.

212221220101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1753894403 (or 1753894392 counting only the distinct ones).

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

Adding to 212221220101 its reverse (101022122212), we get a palindrome (313243342313).

The spelling of 212221220101 in words is "two hundred twelve billion, two hundred twenty-one million, two hundred twenty thousand, one hundred one".