51086308746221 has 4 divisors (see below), whose sum is σ = 58384352852832. Its totient is φ = 43788264639612.

The previous prime is 51086308746203. The next prime is 51086308746223. The reversal of 51086308746221 is 12264780368015.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51086308746221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51086308746223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3649022053295 + ... + 3649022053308.

It is an arithmetic number, because the mean of its divisors is an integer number (14596088213208).

Almost surely, 2^{51086308746221} is an apocalyptic number.

It is an amenable number.

51086308746221 is a deficient number, since it is larger than the sum of its proper divisors (7298044106611).

51086308746221 is an equidigital number, since it uses as much as digits as its factorization.

51086308746221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7298044106610.

The product of its (nonzero) digits is 3870720, while the sum is 53.

The spelling of 51086308746221 in words is "fifty-one trillion, eighty-six billion, three hundred eight million, seven hundred forty-six thousand, two hundred twenty-one".