5151212121 has 24 divisors (see below), whose sum is σ = 7662149152. Its totient is φ = 3075336000.

The previous prime is 5151212119. The next prime is 5151212137. The reversal of 5151212121 is 1212121515.

It is not a de Polignac number, because 5151212121 - 2¹ = 5151212119 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5151212111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81580 + ... + 130221.

Almost surely, 2^5151212121 is an apocalyptic number.

It is an amenable number.

5151212121 is a deficient number, since it is larger than the sum of its proper divisors (2510937031).

5151212121 is a wasteful number, since it uses less digits than its factorization.

5151212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211893 (or 211882 counting only the distinct ones).

The product of its digits is 200, while the sum is 21.

The square root of 5151212121 is about 71771.9452223499. The cubic root of 5151212121 is about 1727.0429756571.

Adding to 5151212121 its reverse (1212121515), we get a palindrome (6363333636).

The spelling of 5151212121 in words is "five billion, one hundred fifty-one million, two hundred twelve thousand, one hundred twenty-one".