20222122221 has 12 divisors (see below), whose sum is σ = 33382551072. Its totient is φ = 11555498376.

The previous prime is 20222122201. The next prime is 20222122247. The reversal of 20222122221 is 12222122202.

20222122221 is a `hidden beast` number, since 202 + 221 + 22 + 221 = 666.

It is not a de Polignac number, because 20222122221 - 2⁶ = 20222122157 is a prime.

It is a super-4 number, since 4×20222122221⁴ (a number of 42 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20222122194 and 20222122203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20222122201) 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, 160492971 + ... + 160493096.

It is an arithmetic number, because the mean of its divisors is an integer number (2781879256).

Almost surely, 2^20222122221 is an apocalyptic number.

20222122221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20222122221 is a deficient number, since it is larger than the sum of its proper divisors (13160428851).

20222122221 is a wasteful number, since it uses less digits than its factorization.

20222122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320986080 (or 320986077 counting only the distinct ones).

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

Adding to 20222122221 its reverse (12222122202), we get a palindrome (32444244423).

The spelling of 20222122221 in words is "twenty billion, two hundred twenty-two million, one hundred twenty-two thousand, two hundred twenty-one".