1213123043220 has 96 divisors (see below), whose sum is σ = 3866649937920. Its totient is φ = 281303890560.

The previous prime is 1213123043207. The next prime is 1213123043257. The reversal of 1213123043220 is 223403213121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39942760 + ... + 39973119.

It is an arithmetic number, because the mean of its divisors is an integer number (40277603520).

Almost surely, 2^{1213123043220} is an apocalyptic number.

1213123043220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213123043220 is an abundant number, since it is smaller than the sum of its proper divisors (2653526894700).

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

1213123043220 is a wasteful number, since it uses less digits than its factorization.

1213123043220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79915925 (or 79915923 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 1213123043220 its reverse (223403213121), we get a palindrome (1436526256341).

The spelling of 1213123043220 in words is "one trillion, two hundred thirteen billion, one hundred twenty-three million, forty-three thousand, two hundred twenty".