1212220120 has 48 divisors (see below), whose sum is σ = 2754264240. Its totient is φ = 480174912.

The previous prime is 1212220117. The next prime is 1212220123. The reversal of 1212220120 is 210222121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1212220117) and next prime (1212220123).

It is a self number, because there is not a number n which added to its sum of digits gives 1212220120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212220123) 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, 456637 + ... + 459283.

It is an arithmetic number, because the mean of its divisors is an integer number (57380505).

Almost surely, 2^1212220120 is an apocalyptic number.

1212220120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212220120 is an abundant number, since it is smaller than the sum of its proper divisors (1542044120).

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

1212220120 is a wasteful number, since it uses less digits than its factorization.

1212220120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2872 (or 2761 counting only the distinct ones).

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

The square root of 1212220120 is about 34816.9516184286. The cubic root of 1212220120 is about 1066.2535644254.

Adding to 1212220120 its reverse (210222121), we get a palindrome (1422442241).

The spelling of 1212220120 in words is "one billion, two hundred twelve million, two hundred twenty thousand, one hundred twenty".