2121166145 has 48 divisors (see below), whose sum is σ = 3121141248. Its totient is φ = 1377129600.

The previous prime is 2121166139. The next prime is 2121166153. The reversal of 2121166145 is 5416611212.

It is not a de Polignac number, because 2121166145 - 2⁴ = 2121166129 is a prime.

It is a super-2 number, since 2×2121166145² = 8998691629388322050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 567272 + ... + 570998.

It is an arithmetic number, because the mean of its divisors is an integer number (65023776).

Almost surely, 2^2121166145 is an apocalyptic number.

It is an amenable number.

2121166145 is a deficient number, since it is larger than the sum of its proper divisors (999975103).

2121166145 is a wasteful number, since it uses less digits than its factorization.

2121166145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3870 (or 3863 counting only the distinct ones).

The product of its digits is 2880, while the sum is 29.

The square root of 2121166145 is about 46056.1195173888. The cubic root of 2121166145 is about 1284.8671596289.

Adding to 2121166145 its reverse (5416611212), we get a palindrome (7537777357).

The spelling of 2121166145 in words is "two billion, one hundred twenty-one million, one hundred sixty-six thousand, one hundred forty-five".