122221112220 has 144 divisors (see below), whose sum is σ = 388202680320. Its totient is φ = 32275734336.

The previous prime is 122221112207. The next prime is 122221112257. The reversal of 122221112220 is 22211122221.

It is a happy number.

122221112220 is a `hidden beast` number, since 1 + 222 + 211 + 12 + 220 = 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 = 122221112193 and 122221112202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 378501 + ... + 622659.

Almost surely, 2^122221112220 is an apocalyptic number.

122221112220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 122221112220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194101340160).

122221112220 is an abundant number, since it is smaller than the sum of its proper divisors (265981568100).

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

122221112220 is a wasteful number, since it uses less digits than its factorization.

122221112220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244286 (or 244272 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 122221112220 its reverse (22211122221), we get a palindrome (144432234441).

The spelling of 122221112220 in words is "one hundred twenty-two billion, two hundred twenty-one million, one hundred twelve thousand, two hundred twenty".