20122221222 has 24 divisors (see below), whose sum is σ = 43647332976. Its totient is φ = 6699839856.

The previous prime is 20122221221. The next prime is 20122221227. The reversal of 20122221222 is 22212222102.

20122221222 is a `hidden beast` number, since 201 + 22 + 221 + 222 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20122221195 and 20122221204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20122221221) 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, 614193 + ... + 646124.

It is an arithmetic number, because the mean of its divisors is an integer number (1818638874).

Almost surely, 2^20122221222 is an apocalyptic number.

20122221222 is an abundant number, since it is smaller than the sum of its proper divisors (23525111754).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20122221222 is a wasteful number, since it uses less digits than its factorization.

20122221222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1261212 (or 1261209 counting only the distinct ones).

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

Adding to 20122221222 its reverse (22212222102), we get a palindrome (42334443324).

The spelling of 20122221222 in words is "twenty billion, one hundred twenty-two million, two hundred twenty-one thousand, two hundred twenty-two".