2179792121 has 4 divisors (see below), whose sum is σ = 2347468452. Its totient is φ = 2012115792.

The previous prime is 2179792099. The next prime is 2179792127. The reversal of 2179792121 is 1212979712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1119638521 + 1060153600 = 33461^2 + 32560^2 .

It is a cyclic number.

It is not a de Polignac number, because 2179792121 - 2¹⁸ = 2179529977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2179792127) 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, 83838146 + ... + 83838171.

It is an arithmetic number, because the mean of its divisors is an integer number (586867113).

Almost surely, 2^2179792121 is an apocalyptic number.

It is an amenable number.

2179792121 is a deficient number, since it is larger than the sum of its proper divisors (167676331).

2179792121 is a wasteful number, since it uses less digits than its factorization.

2179792121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167676330.

The product of its digits is 31752, while the sum is 41.

The square root of 2179792121 is about 46688.2439271387. The cubic root of 2179792121 is about 1296.5970410059.

The spelling of 2179792121 in words is "two billion, one hundred seventy-nine million, seven hundred ninety-two thousand, one hundred twenty-one".