2121458165 has 8 divisors (see below), whose sum is σ = 2565795840. Its totient is φ = 1683802512.

The previous prime is 2121458137. The next prime is 2121458173. The reversal of 2121458165 is 5618541212.

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 2121458165 - 2²⁰ = 2120409589 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1669805 + ... + 1671074.

It is an arithmetic number, because the mean of its divisors is an integer number (320724480).

Almost surely, 2^2121458165 is an apocalyptic number.

It is an amenable number.

2121458165 is a deficient number, since it is larger than the sum of its proper divisors (444337675).

2121458165 is a wasteful number, since it uses less digits than its factorization.

2121458165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3341011.

The product of its digits is 19200, while the sum is 35.

The square root of 2121458165 is about 46059.2896710316. The cubic root of 2121458165 is about 1284.9261192869.

Adding to 2121458165 its reverse (5618541212), we get a palindrome (7739999377).

The spelling of 2121458165 in words is "two billion, one hundred twenty-one million, four hundred fifty-eight thousand, one hundred sixty-five".