2121533145 has 12 divisors (see below), whose sum is σ = 3677324196. Its totient is φ = 1131484320.

The previous prime is 2121533129. The next prime is 2121533153. The reversal of 2121533145 is 5413351212.

2121533145 is a `hidden beast` number, since 2 + 121 + 533 + 1 + 4 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 472279824 + 1649253321 = 21732^2 + 40611^2 .

It is not a de Polignac number, because 2121533145 - 2⁴ = 2121533129 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23572546 + ... + 23572635.

It is an arithmetic number, because the mean of its divisors is an integer number (306443683).

Almost surely, 2^2121533145 is an apocalyptic number.

It is an amenable number.

2121533145 is a deficient number, since it is larger than the sum of its proper divisors (1555791051).

2121533145 is a wasteful number, since it uses less digits than its factorization.

2121533145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47145192 (or 47145189 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 2121533145 is about 46060.1036147337. The cubic root of 2121533145 is about 1284.9412570864.

Adding to 2121533145 its reverse (5413351212), we get a palindrome (7534884357).

The spelling of 2121533145 in words is "two billion, one hundred twenty-one million, five hundred thirty-three thousand, one hundred forty-five".