1220211121212 has 72 divisors (see below), whose sum is σ = 3218699012256. Its totient is φ = 389032136064.

The previous prime is 1220211121177. The next prime is 1220211121267. The reversal of 1220211121212 is 2121211120221.

1220211121212 is a `hidden beast` number, since 1 + 220 + 211 + 1 + 21 + 212 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

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, 25940098 + ... + 25987094.

It is an arithmetic number, because the mean of its divisors is an integer number (44704152948).

Almost surely, 2^{1220211121212} is an apocalyptic number.

1220211121212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1220211121212 is an abundant number, since it is smaller than the sum of its proper divisors (1998487891044).

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

1220211121212 is a wasteful number, since it uses less digits than its factorization.

1220211121212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78387 (or 78382 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1220211121212 its reverse (2121211120221), we get a palindrome (3341422241433).

Subtracting 1220211121212 from its reverse (2121211120221), we obtain a palindrome (900999999009).

The spelling of 1220211121212 in words is "one trillion, two hundred twenty billion, two hundred eleven million, one hundred twenty-one thousand, two hundred twelve".