1212102122220 has 72 divisors (see below), whose sum is σ = 4010956120080. Its totient is φ = 293842938240.

The previous prime is 1212102122213. The next prime is 1212102122237. The reversal of 1212102122220 is 222212012121.

It is a happy number.

1212102122220 is a `hidden beast` number, since 1 + 21 + 210 + 212 + 2 + 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 = 1212102122193 and 1212102122202.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 306084415 + ... + 306088374.

It is an arithmetic number, because the mean of its divisors is an integer number (55707723890).

Almost surely, 2^{1212102122220} is an apocalyptic number.

1212102122220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212102122220 is an abundant number, since it is smaller than the sum of its proper divisors (2798853997860).

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

1212102122220 is a wasteful number, since it uses less digits than its factorization.

1212102122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612172815 (or 612172810 counting only the distinct ones).

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

Adding to 1212102122220 its reverse (222212012121), we get a palindrome (1434314134341).

The spelling of 1212102122220 in words is "one trillion, two hundred twelve billion, one hundred two million, one hundred twenty-two thousand, two hundred twenty".