2121531145 has 16 divisors (see below), whose sum is σ = 2599153920. Its totient is φ = 1661906944.

The previous prime is 2121531131. The next prime is 2121531151. The reversal of 2121531145 is 5411351212.

It is a cyclic number.

It is not a de Polignac number, because 2121531145 - 2¹⁵ = 2121498377 is a prime.

It is a super-2 number, since 2×2121531145² = 9001788798410022050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61824 + ... + 89806.

It is an arithmetic number, because the mean of its divisors is an integer number (162447120).

Almost surely, 2^2121531145 is an apocalyptic number.

It is an amenable number.

2121531145 is a deficient number, since it is larger than the sum of its proper divisors (477622775).

2121531145 is a wasteful number, since it uses less digits than its factorization.

2121531145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28304.

The product of its digits is 1200, while the sum is 25.

The square root of 2121531145 is about 46060.0819039654. The cubic root of 2121531145 is about 1284.9408533087.

Adding to 2121531145 its reverse (5411351212), we get a palindrome (7532882357).

The spelling of 2121531145 in words is "two billion, one hundred twenty-one million, five hundred thirty-one thousand, one hundred forty-five".