2121709873161 has 8 divisors (see below), whose sum is σ = 2834708101344. Its totient is φ = 1411592446880.

The previous prime is 2121709873123. The next prime is 2121709873189. The reversal of 2121709873161 is 1613789071212.

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 2121709873161 - 2¹⁹ = 2121709348873 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2121709873161.

It is not an unprimeable number, because it can be changed into a prime (2121709873961) 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, 720198756 + ... + 720201701.

It is an arithmetic number, because the mean of its divisors is an integer number (354338512668).

Almost surely, 2^{2121709873161} is an apocalyptic number.

It is an amenable number.

2121709873161 is a deficient number, since it is larger than the sum of its proper divisors (712998228183).

2121709873161 is a wasteful number, since it uses less digits than its factorization.

2121709873161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1440400951.

The product of its (nonzero) digits is 254016, while the sum is 48.

The spelling of 2121709873161 in words is "two trillion, one hundred twenty-one billion, seven hundred nine million, eight hundred seventy-three thousand, one hundred sixty-one".