1212012220 has 24 divisors (see below), whose sum is σ = 2588367600. Its totient is φ = 476587392.

The previous prime is 1212012173. The next prime is 1212012251. The reversal of 1212012220 is 222102121.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212012220.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 512385 + ... + 514744.

It is an arithmetic number, because the mean of its divisors is an integer number (107848650).

Almost surely, 2^1212012220 is an apocalyptic number.

1212012220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212012220 is an abundant number, since it is smaller than the sum of its proper divisors (1376355380).

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

1212012220 is a wasteful number, since it uses less digits than its factorization.

1212012220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1027197 (or 1027195 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1212012220 is about 34813.9658757804. The cubic root of 1212012220 is about 1066.1926055324.

Adding to 1212012220 its reverse (222102121), we get a palindrome (1434114341).

The spelling of 1212012220 in words is "one billion, two hundred twelve million, twelve thousand, two hundred twenty".