51616217005221 has 32 divisors (see below), whose sum is σ = 77328210960000. Its totient is φ = 30349868762880.

The previous prime is 51616217005181. The next prime is 51616217005273. The reversal of 51616217005221 is 12250071261615.

It is a de Polignac number, because none of the positive numbers 2^k-51616217005221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51616217005221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51616217005121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60137946 + ... + 60990203.

It is an arithmetic number, because the mean of its divisors is an integer number (2416506592500).

Almost surely, 2^{51616217005221} is an apocalyptic number.

It is an amenable number.

51616217005221 is a deficient number, since it is larger than the sum of its proper divisors (25711993954779).

51616217005221 is a wasteful number, since it uses less digits than its factorization.

51616217005221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121128549.

The product of its (nonzero) digits is 50400, while the sum is 39.

Adding to 51616217005221 its reverse (12250071261615), we get a palindrome (63866288266836).

The spelling of 51616217005221 in words is "fifty-one trillion, six hundred sixteen billion, two hundred seventeen million, five thousand, two hundred twenty-one".