71130111121021 has 8 divisors (see below), whose sum is σ = 73588222744920. Its totient is φ = 68672356108608.

The previous prime is 71130111120983. The next prime is 71130111121039. The reversal of 71130111121021 is 12012111103117.

It can be written as a sum of positive squares in 4 ways, for example, as 697968348025 + 70432142772996 = 835445^2 + 8392386^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71130111121021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71130111120983 and 71130111121001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71130111131021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88747026 + ... + 89544931.

It is an arithmetic number, because the mean of its divisors is an integer number (9198527843115).

Almost surely, 2^{71130111121021} is an apocalyptic number.

It is an amenable number.

71130111121021 is a deficient number, since it is larger than the sum of its proper divisors (2458111623899).

71130111121021 is a wasteful number, since it uses less digits than its factorization.

71130111121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178305743.

The product of its (nonzero) digits is 84, while the sum is 22.

Adding to 71130111121021 its reverse (12012111103117), we get a palindrome (83142222224138).

The spelling of 71130111121021 in words is "seventy-one trillion, one hundred thirty billion, one hundred eleven million, one hundred twenty-one thousand, twenty-one".