2222122221 has 32 divisors (see below), whose sum is σ = 3596067840. Its totient is φ = 1344956400.

The previous prime is 2222122171. The next prime is 2222122237. The reversal of 2222122221 is 1222212222.

2222122221 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2222122221 - 2⁷ = 2222122093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2222122194 and 2222122203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2222122261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 239886 + ... + 248976.

It is an arithmetic number, because the mean of its divisors is an integer number (112377120).

Almost surely, 2^2222122221 is an apocalyptic number.

It is an amenable number.

2222122221 is a deficient number, since it is larger than the sum of its proper divisors (1373945619).

2222122221 is a wasteful number, since it uses less digits than its factorization.

2222122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9934 (or 9928 counting only the distinct ones).

The product of its digits is 256, while the sum is 18.

The square root of 2222122221 is about 47139.3913940348. The cubic root of 2222122221 is about 1304.9363055185.

Adding to 2222122221 its reverse (1222212222), we get a palindrome (3444334443).

Subtracting from 2222122221 its reverse (1222212222), we obtain a palindrome (999909999).

The spelling of 2222122221 in words is "two billion, two hundred twenty-two million, one hundred twenty-two thousand, two hundred twenty-one".