71126231021 has 4 divisors (see below), whose sum is σ = 74218675872. Its totient is φ = 68033786172.

The previous prime is 71126231003. The next prime is 71126231039. The reversal of 71126231021 is 12013262117.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (71126231003) and next prime (71126231039).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71126231021 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 (71126231041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1546222391 + ... + 1546222436.

It is an arithmetic number, because the mean of its divisors is an integer number (18554668968).

Almost surely, 2^71126231021 is an apocalyptic number.

It is an amenable number.

71126231021 is a deficient number, since it is larger than the sum of its proper divisors (3092444851).

71126231021 is a wasteful number, since it uses less digits than its factorization.

71126231021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3092444850.

The product of its (nonzero) digits is 1008, while the sum is 26.

Adding to 71126231021 its reverse (12013262117), we get a palindrome (83139493138).

The spelling of 71126231021 in words is "seventy-one billion, one hundred twenty-six million, two hundred thirty-one thousand, twenty-one".