1212122210220 has 144 divisors (see below), whose sum is σ = 3793713775488. Its totient is φ = 313093693440.

The previous prime is 1212122210213. The next prime is 1212122210237. The reversal of 1212122210220 is 220122212121.

It is a happy number.

1212122210220 is a `hidden beast` number, since 1 + 21 + 212 + 2 + 210 + 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 = 1212122210193 and 1212122210202.

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, 82080 + ... + 1559160.

It is an arithmetic number, because the mean of its divisors is an integer number (26345234552).

Almost surely, 2^{1212122210220} is an apocalyptic number.

1212122210220 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 1212122210220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1896856887744).

1212122210220 is an abundant number, since it is smaller than the sum of its proper divisors (2581591565268).

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

1212122210220 is a wasteful number, since it uses less digits than its factorization.

1212122210220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1477240 (or 1477235 counting only the distinct ones).

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

Adding to 1212122210220 its reverse (220122212121), we get a palindrome (1432244422341).

The spelling of 1212122210220 in words is "one trillion, two hundred twelve billion, one hundred twenty-two million, two hundred ten thousand, two hundred twenty".