1220022121212 has 36 divisors (see below), whose sum is σ = 3083989512240. Its totient is φ = 406668145152.

The previous prime is 1220022121111. The next prime is 1220022121217. The reversal of 1220022121212 is 2121212200221.

It is a happy number.

1220022121212 is a `hidden beast` number, since 1 + 220 + 0 + 221 + 212 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220022121217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2784193 + ... + 3192455.

It is an arithmetic number, because the mean of its divisors is an integer number (85666375340).

Almost surely, 2^{1220022121212} is an apocalyptic number.

1220022121212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1220022121212 is an abundant number, since it is smaller than the sum of its proper divisors (1863967391028).

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

1220022121212 is a wasteful number, since it uses less digits than its factorization.

1220022121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491282 (or 491277 counting only the distinct ones).

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

Adding to 1220022121212 its reverse (2121212200221), we get a palindrome (3341234321433).

The spelling of 1220022121212 in words is "one trillion, two hundred twenty billion, twenty-two million, one hundred twenty-one thousand, two hundred twelve".