51221501072071 has 16 divisors (see below), whose sum is σ = 56432408278176. Its totient is φ = 46103014000000.

The previous prime is 51221501072057. The next prime is 51221501072087. The reversal of 51221501072071 is 17027010512215.

It is a cyclic number.

It is not a de Polignac number, because 51221501072071 - 2⁷ = 51221501071943 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 (51221501072771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56725221 + ... + 57621121.

It is an arithmetic number, because the mean of its divisors is an integer number (3527025517386).

Almost surely, 2^{51221501072071} is an apocalyptic number.

51221501072071 is a deficient number, since it is larger than the sum of its proper divisors (5210907206105).

51221501072071 is a wasteful number, since it uses less digits than its factorization.

51221501072071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947474.

The product of its (nonzero) digits is 9800, while the sum is 34.

Adding to 51221501072071 its reverse (17027010512215), we get a palindrome (68248511584286).

The spelling of 51221501072071 in words is "fifty-one trillion, two hundred twenty-one billion, five hundred one million, seventy-two thousand, seventy-one".