1213012021128 has 128 divisors (see below), whose sum is σ = 3116408515200. Its totient is φ = 393353117696.

The previous prime is 1213012021127. The next prime is 1213012021159. The reversal of 1213012021128 is 8211202103121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 1213012021098 and 1213012021107.

It is not an unprimeable number, because it can be changed into a prime (1213012021127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33049075 + ... + 33085757.

It is an arithmetic number, because the mean of its divisors is an integer number (24346941525).

Almost surely, 2^{1213012021128} is an apocalyptic number.

It is an amenable number.

1213012021128 is an abundant number, since it is smaller than the sum of its proper divisors (1903396494072).

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

1213012021128 is a wasteful number, since it uses less digits than its factorization.

1213012021128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37031 (or 37027 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 24.

Adding to 1213012021128 its reverse (8211202103121), we get a palindrome (9424214124249).

The spelling of 1213012021128 in words is "one trillion, two hundred thirteen billion, twelve million, twenty-one thousand, one hundred twenty-eight".