2121165106 has 8 divisors (see below), whose sum is σ = 3368909340. Its totient is φ = 998195328.

The previous prime is 2121165091. The next prime is 2121165197. The reversal of 2121165106 is 6015611212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2080728225 + 40436881 = 45615^2 + 6359^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31193571 + ... + 31193638.

Almost surely, 2^2121165106 is an apocalyptic number.

2121165106 is a deficient number, since it is larger than the sum of its proper divisors (1247744234).

2121165106 is a wasteful number, since it uses less digits than its factorization.

2121165106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62387228.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 2121165106 is about 46056.1082376703. The cubic root of 2121165106 is about 1284.8669498423.

Adding to 2121165106 its reverse (6015611212), we get a palindrome (8136776318).

The spelling of 2121165106 in words is "two billion, one hundred twenty-one million, one hundred sixty-five thousand, one hundred six".