1212101222220 has 240 divisors, whose sum is σ = 4534547770368. Its totient is φ = 265005924480.

The previous prime is 1212101222219. The next prime is 1212101222221. The reversal of 1212101222220 is 222221012121.

It is a happy number.

1212101222220 is a `hidden beast` number, since 1 + 212 + 10 + 1 + 222 + 220 = 666.

It is an interprime number because it is at equal distance from previous prime (1212101222219) and next prime (1212101222221).

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 = 1212101222193 and 1212101222202.

It is not an unprimeable number, because it can be changed into a prime (1212101222221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2062816 + ... + 2584455.

Almost surely, 2^{1212101222220} is an apocalyptic number.

1212101222220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212101222220 is an abundant number, since it is smaller than the sum of its proper divisors (3322446548148).

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

1212101222220 is a wasteful number, since it uses less digits than its factorization.

1212101222220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4647322 (or 4647311 counting only the distinct ones).

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

Adding to 1212101222220 its reverse (222221012121), we get a palindrome (1434322234341).

The spelling of 1212101222220 in words is "one trillion, two hundred twelve billion, one hundred one million, two hundred twenty-two thousand, two hundred twenty".