2122210101221 has 24 divisors (see below), whose sum is σ = 2538746133336. Its totient is φ = 1767764705280.

The previous prime is 2122210101217. The next prime is 2122210101233. The reversal of 2122210101221 is 1221010122212.

It can be written as a sum of positive squares in 4 ways, for example, as 462725097121 + 1659485004100 = 680239^2 + 1288210^2 .

It is not a de Polignac number, because 2122210101221 - 2² = 2122210101217 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2122210101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2122210101721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1538846 + ... + 2571471.

It is an arithmetic number, because the mean of its divisors is an integer number (105781088889).

Almost surely, 2^{2122210101221} is an apocalyptic number.

It is an amenable number.

2122210101221 is a deficient number, since it is larger than the sum of its proper divisors (416536032115).

2122210101221 is a wasteful number, since it uses less digits than its factorization.

2122210101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4110629 (or 4110622 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2122210101221 its reverse (1221010122212), we get a palindrome (3343220223433).

The spelling of 2122210101221 in words is "two trillion, one hundred twenty-two billion, two hundred ten million, one hundred one thousand, two hundred twenty-one".