51916610221 has 8 divisors (see below), whose sum is σ = 59338270400. Its totient is φ = 44496200448.

The previous prime is 51916610203. The next prime is 51916610243. The reversal of 51916610221 is 12201661915.

It is a happy number.

51916610221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 51916610221 - 2⁵ = 51916610189 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 (51916610201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221871 + ... + 391228.

It is an arithmetic number, because the mean of its divisors is an integer number (7417283800).

Almost surely, 2^51916610221 is an apocalyptic number.

It is an amenable number.

51916610221 is a deficient number, since it is larger than the sum of its proper divisors (7421660179).

51916610221 is a wasteful number, since it uses less digits than its factorization.

51916610221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625203.

The product of its (nonzero) digits is 6480, while the sum is 34.

The spelling of 51916610221 in words is "fifty-one billion, nine hundred sixteen million, six hundred ten thousand, two hundred twenty-one".