1212220111212 has 96 divisors (see below), whose sum is σ = 3429286560000. Its totient is φ = 367255296000.

The previous prime is 1212220111163. The next prime is 1212220111213. The reversal of 1212220111212 is 2121110222121.

1212220111212 is a `hidden beast` number, since 121 + 2 + 220 + 111 + 212 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (1212220111213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5173164 + ... + 5402412.

It is an arithmetic number, because the mean of its divisors is an integer number (35721735000).

Almost surely, 2^{1212220111212} is an apocalyptic number.

1212220111212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1212220111212 is an abundant number, since it is smaller than the sum of its proper divisors (2217066448788).

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

1212220111212 is a wasteful number, since it uses less digits than its factorization.

1212220111212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233724 (or 233716 counting only the distinct ones).

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

Adding to 1212220111212 its reverse (2121110222121), we get a palindrome (3333330333333).

The spelling of 1212220111212 in words is "one trillion, two hundred twelve billion, two hundred twenty million, one hundred eleven thousand, two hundred twelve".