2121121219072 has 40 divisors (see below), whose sum is σ = 4487399619516. Its totient is φ = 998174687232.

The previous prime is 2121121219057. The next prime is 2121121219073. The reversal of 2121121219072 is 2709121211212.

It can be written as a sum of positive squares in 2 ways, for example, as 2120448542976 + 672676096 = 1456176^2 + 25936^2 .

It is not an unprimeable number, because it can be changed into a prime (2121121219073) 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 3 ways as a sum of consecutive naturals, for example, 121838793 + ... + 121856200.

Almost surely, 2^{2121121219072} is an apocalyptic number.

It is an amenable number.

2121121219072 is an abundant number, since it is smaller than the sum of its proper divisors (2366278400444).

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

2121121219072 is an equidigital number, since it uses as much as digits as its factorization.

2121121219072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243695028 (or 243695012 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 31.

The spelling of 2121121219072 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-one million, two hundred nineteen thousand, seventy-two".