71621327051 has 16 divisors (see below), whose sum is σ = 77261437440. Its totient is φ = 66173073120.

The previous prime is 71621327047. The next prime is 71621327053. The reversal of 71621327051 is 15072312617.

It is a cyclic number.

It is not a de Polignac number, because 71621327051 - 2² = 71621327047 is a prime.

It is a super-2 number, since 2×71621327051² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71621327053) 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, 473726 + ... + 606348.

It is an arithmetic number, because the mean of its divisors is an integer number (4828839840).

Almost surely, 2^71621327051 is an apocalyptic number.

71621327051 is a deficient number, since it is larger than the sum of its proper divisors (5640110389).

71621327051 is a wasteful number, since it uses less digits than its factorization.

71621327051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133346.

The product of its (nonzero) digits is 17640, while the sum is 35.

Adding to 71621327051 its reverse (15072312617), we get a palindrome (86693639668).

The spelling of 71621327051 in words is "seventy-one billion, six hundred twenty-one million, three hundred twenty-seven thousand, fifty-one".