1212212012220 has 72 divisors (see below), whose sum is σ = 4011319756080. Its totient is φ = 293869578240.

The previous prime is 1212212012213. The next prime is 1212212012251. The reversal of 1212212012220 is 222102122121.

It is a happy number.

1212212012220 is a `hidden beast` number, since 1 + 21 + 221 + 201 + 2 + 220 = 666.

It is a super-2 number, since 2×1212212012220² (a number of 25 digits) contains 22 as substring.

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 = 1212212012193 and 1212212012202.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 306112165 + ... + 306116124.

It is an arithmetic number, because the mean of its divisors is an integer number (55712774390).

Almost surely, 2^{1212212012220} is an apocalyptic number.

1212212012220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212212012220 is an abundant number, since it is smaller than the sum of its proper divisors (2799107743860).

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

1212212012220 is a wasteful number, since it uses less digits than its factorization.

1212212012220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612228315 (or 612228310 counting only the distinct ones).

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

Adding to 1212212012220 its reverse (222102122121), we get a palindrome (1434314134341).

The spelling of 1212212012220 in words is "one trillion, two hundred twelve billion, two hundred twelve million, twelve thousand, two hundred twenty".