2120155665172 has 6 divisors (see below), whose sum is σ = 3710272414058. Its totient is φ = 1060077832584.

The previous prime is 2120155665041. The next prime is 2120155665241. The reversal of 2120155665172 is 2715665510212.

It can be written as a sum of positive squares in only one way, i.e., 2000629198096 + 119526467076 = 1414436^2 + 345726^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265019458143 + ... + 265019458150.

Almost surely, 2^{2120155665172} is an apocalyptic number.

It is an amenable number.

2120155665172 is a deficient number, since it is larger than the sum of its proper divisors (1590116748886).

2120155665172 is a wasteful number, since it uses less digits than its factorization.

2120155665172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530038916297 (or 530038916295 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 43.

The spelling of 2120155665172 in words is "two trillion, one hundred twenty billion, one hundred fifty-five million, six hundred sixty-five thousand, one hundred seventy-two".