2122022221 has 12 divisors (see below), whose sum is σ = 2338204032. Its totient is φ = 1909910000.

The previous prime is 2122022213. The next prime is 2122022237. The reversal of 2122022221 is 1222202212.

It is not a de Polignac number, because 2122022221 - 2³ = 2122022213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2122022195 and 2122022204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2122022291) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102756 + ... + 121666.

It is an arithmetic number, because the mean of its divisors is an integer number (194850336).

Almost surely, 2^2122022221 is an apocalyptic number.

It is an amenable number.

2122022221 is a deficient number, since it is larger than the sum of its proper divisors (216181811).

2122022221 is a wasteful number, since it uses less digits than its factorization.

2122022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19124 (or 19023 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 2122022221 is about 46065.4124153904. The cubic root of 2122022221 is about 1285.0399884602.

Adding to 2122022221 its reverse (1222202212), we get a palindrome (3344224433).

Subtracting from 2122022221 its reverse (1222202212), we obtain a square (899820009 = 29997²).

The spelling of 2122022221 in words is "two billion, one hundred twenty-two million, twenty-two thousand, two hundred twenty-one".