122121112111220 has 24 divisors (see below), whose sum is σ = 256454543003904. Its totient is φ = 48848405307296.

The previous prime is 122121112111183. The next prime is 122121112111259. The reversal of 122121112111220 is 22111211121221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 122121112111192 and 122121112111201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47929877 + ... + 50413443.

It is an arithmetic number, because the mean of its divisors is an integer number (10685605958496).

Almost surely, 2^{122121112111220} is an apocalyptic number.

122121112111220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

122121112111220 is an abundant number, since it is smaller than the sum of its proper divisors (134333430892684).

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

122121112111220 is a wasteful number, since it uses less digits than its factorization.

122121112111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4942159 (or 4942157 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 122121112111220 its reverse (22111211121221), we get a palindrome (144232323232441).

The spelling of 122121112111220 in words is "one hundred twenty-two trillion, one hundred twenty-one billion, one hundred twelve million, one hundred eleven thousand, two hundred twenty".