51761001750221 has 8 divisors (see below), whose sum is σ = 51834096597888. Its totient is φ = 51687918000000.

The previous prime is 51761001750203. The next prime is 51761001750223. The reversal of 51761001750221 is 12205710016715.

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 51761001750221 - 2³⁸ = 51486123843277 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 (51761001750223) 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, 6582941 + ... + 12118461.

It is an arithmetic number, because the mean of its divisors is an integer number (6479262074736).

Almost surely, 2^{51761001750221} is an apocalyptic number.

It is an amenable number.

51761001750221 is a deficient number, since it is larger than the sum of its proper divisors (73094847667).

51761001750221 is a wasteful number, since it uses less digits than its factorization.

51761001750221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5548723.

The product of its (nonzero) digits is 29400, while the sum is 38.

Adding to 51761001750221 its reverse (12205710016715), we get a palindrome (63966711766936).

The spelling of 51761001750221 in words is "fifty-one trillion, seven hundred sixty-one billion, one million, seven hundred fifty thousand, two hundred twenty-one".