2120115531605 has 8 divisors (see below), whose sum is σ = 2545428127032. Its totient is φ = 1695232765888.

The previous prime is 2120115531539. The next prime is 2120115531607. The reversal of 2120115531605 is 5061355110212.

It can be written as a sum of positive squares in 4 ways, for example, as 273663950641 + 1846451580964 = 523129^2 + 1358842^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2120115531605 - 2²² = 2120111337301 is a prime.

It is a super-4 number, since 4×2120115531605⁴ (a number of 50 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120115531607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107446574 + ... + 107466303.

It is an arithmetic number, because the mean of its divisors is an integer number (318178515879).

Almost surely, 2^{2120115531605} is an apocalyptic number.

It is an amenable number.

2120115531605 is a deficient number, since it is larger than the sum of its proper divisors (425312595427).

2120115531605 is a wasteful number, since it uses less digits than its factorization.

2120115531605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214914855.

The product of its (nonzero) digits is 9000, while the sum is 32.

The spelling of 2120115531605 in words is "two trillion, one hundred twenty billion, one hundred fifteen million, five hundred thirty-one thousand, six hundred five".