51550602221 has 4 divisors (see below), whose sum is σ = 51658224000. Its totient is φ = 51442980444.

The previous prime is 51550602193. The next prime is 51550602263. The reversal of 51550602221 is 12220605515.

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 not a de Polignac number, because 51550602221 - 2¹⁰ = 51550601197 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 (51550662221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53810171 + ... + 53811128.

It is an arithmetic number, because the mean of its divisors is an integer number (12914556000).

Almost surely, 2^51550602221 is an apocalyptic number.

It is an amenable number.

51550602221 is a deficient number, since it is larger than the sum of its proper divisors (107621779).

51550602221 is a wasteful number, since it uses less digits than its factorization.

51550602221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107621778.

The product of its (nonzero) digits is 6000, while the sum is 29.

The spelling of 51550602221 in words is "fifty-one billion, five hundred fifty million, six hundred two thousand, two hundred twenty-one".