51521211 has 32 divisors (see below), whose sum is σ = 88128000. Its totient is φ = 29138400.

The previous prime is 51521209. The next prime is 51521263. The reversal of 51521211 is 11212515.

51521211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51521211 - 2¹ = 51521209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51521201) 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 31 ways as a sum of consecutive naturals, for example, 17740 + ... + 20438.

It is an arithmetic number, because the mean of its divisors is an integer number (2754000).

Almost surely, 2^51521211 is an apocalyptic number.

51521211 is a deficient number, since it is larger than the sum of its proper divisors (36606789).

51521211 is a wasteful number, since it uses less digits than its factorization.

51521211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2816 (or 2810 counting only the distinct ones).

The product of its digits is 100, while the sum is 18.

The square root of 51521211 is about 7177.8277354643. The cubic root of 51521211 is about 372.1020141655.

Adding to 51521211 its reverse (11212515), we get a palindrome (62733726).

The spelling of 51521211 in words is "fifty-one million, five hundred twenty-one thousand, two hundred eleven".