1212121022220 has 36 divisors (see below), whose sum is σ = 3676767101280. Its totient is φ = 323232272544.

The previous prime is 1212121022219. The next prime is 1212121022239. The reversal of 1212121022220 is 222201212121.

It is a happy number.

1212121022220 is a `hidden beast` number, since 1 + 212 + 1 + 210 + 22 + 220 = 666.

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 = 1212121022193 and 1212121022202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3367002660 + ... + 3367003019.

It is an arithmetic number, because the mean of its divisors is an integer number (102132419480).

Almost surely, 2^{1212121022220} is an apocalyptic number.

1212121022220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212121022220 is an abundant number, since it is smaller than the sum of its proper divisors (2464646079060).

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

1212121022220 is a wasteful number, since it uses less digits than its factorization.

1212121022220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6734005694 (or 6734005689 counting only the distinct ones).

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

Adding to 1212121022220 its reverse (222201212121), we get a palindrome (1434322234341).

The spelling of 1212121022220 in words is "one trillion, two hundred twelve billion, one hundred twenty-one million, twenty-two thousand, two hundred twenty".