1212022121220 has 36 divisors (see below), whose sum is σ = 3676467101580. Its totient is φ = 323205898944.

The previous prime is 1212022121201. The next prime is 1212022121251. The reversal of 1212022121220 is 221212202121.

It is a happy number.

1212022121220 is a `hidden beast` number, since 1 + 212 + 0 + 221 + 212 + 20 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 547233021504 + 664789099716 = 739752^2 + 815346^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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 = 1212022121193 and 1212022121202.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3366727935 + ... + 3366728294.

It is an arithmetic number, because the mean of its divisors is an integer number (102124086155).

Almost surely, 2^{1212022121220} is an apocalyptic number.

1212022121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212022121220 is an abundant number, since it is smaller than the sum of its proper divisors (2464444980360).

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

1212022121220 is a wasteful number, since it uses less digits than its factorization.

1212022121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6733456244 (or 6733456239 counting only the distinct ones).

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

Adding to 1212022121220 its reverse (221212202121), we get a palindrome (1433234323341).

It can be divided in two parts, 121202 and 2121220, that added together give a palindrome (2242422).

The spelling of 1212022121220 in words is "one trillion, two hundred twelve billion, twenty-two million, one hundred twenty-one thousand, two hundred twenty".