20120222221 has 16 divisors (see below), whose sum is σ = 22185332928. Its totient is φ = 18094752000.

The previous prime is 20120222201. The next prime is 20120222261. The reversal of 20120222221 is 12222202102.

It is a cyclic number.

It is not a de Polignac number, because 20120222221 - 2⁷ = 20120222093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20120222195 and 20120222204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120222201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1433986 + ... + 1447948.

It is an arithmetic number, because the mean of its divisors is an integer number (1386583308).

Almost surely, 2^20120222221 is an apocalyptic number.

It is an amenable number.

20120222221 is a deficient number, since it is larger than the sum of its proper divisors (2065110707).

20120222221 is a wasteful number, since it uses less digits than its factorization.

20120222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15372.

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

Adding to 20120222221 its reverse (12222202102), we get a palindrome (32342424323).

The spelling of 20120222221 in words is "twenty billion, one hundred twenty million, two hundred twenty-two thousand, two hundred twenty-one".