51211205211 has 8 divisors (see below), whose sum is σ = 69438922560. Its totient is φ = 33562145672.

The previous prime is 51211205209. The next prime is 51211205219. The reversal of 51211205211 is 11250211215.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51211205211 - 2¹ = 51211205209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51211205219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144664245 + ... + 144664598.

It is an arithmetic number, because the mean of its divisors is an integer number (8679865320).

Almost surely, 2^51211205211 is an apocalyptic number.

51211205211 is a deficient number, since it is larger than the sum of its proper divisors (18227717349).

51211205211 is a wasteful number, since it uses less digits than its factorization.

51211205211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289328905.

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

Adding to 51211205211 its reverse (11250211215), we get a palindrome (62461416426).

The spelling of 51211205211 in words is "fifty-one billion, two hundred eleven million, two hundred five thousand, two hundred eleven".