1212310113220 has 24 divisors (see below), whose sum is σ = 2556414946008. Its totient is φ = 482911910400.

The previous prime is 1212310113173. The next prime is 1212310113229. The reversal of 1212310113220 is 223110132121.

It can be written as a sum of positive squares in 4 ways, for example, as 361650687876 + 850659425344 = 601374^2 + 922312^2 .

It is not an unprimeable number, because it can be changed into a prime (1212310113229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125753491 + ... + 125763130.

It is an arithmetic number, because the mean of its divisors is an integer number (106517289417).

Almost surely, 2^{1212310113220} is an apocalyptic number.

1212310113220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212310113220 is an abundant number, since it is smaller than the sum of its proper divisors (1344104832788).

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

1212310113220 is a wasteful number, since it uses less digits than its factorization.

1212310113220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251516871 (or 251516869 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1212310113220 its reverse (223110132121), we get a palindrome (1435420245341).

The spelling of 1212310113220 in words is "one trillion, two hundred twelve billion, three hundred ten million, one hundred thirteen thousand, two hundred twenty".