1212021013120 has 32 divisors (see below), whose sum is σ = 2897487736020. Its totient is φ = 484808404992.

The previous prime is 1212021013097. The next prime is 1212021013129. The reversal of 1212021013120 is 213101202121.

It can be written as a sum of positive squares in 2 ways, for example, as 1046398060096 + 165622953024 = 1022936^2 + 406968^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 1212021013094 and 1212021013103.

It is not an unprimeable number, because it can be changed into a prime (1212021013129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 946890777 + ... + 946892056.

Almost surely, 2^{1212021013120} is an apocalyptic number.

1212021013120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212021013120 is an abundant number, since it is smaller than the sum of its proper divisors (1685466722900).

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

1212021013120 is an equidigital number, since it uses as much as digits as its factorization.

1212021013120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1893782852 (or 1893782840 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 1212021013120 its reverse (213101202121), we get a palindrome (1425122215241).

The spelling of 1212021013120 in words is "one trillion, two hundred twelve billion, twenty-one million, thirteen thousand, one hundred twenty".