71286040121 has 4 divisors (see below), whose sum is σ = 73212689892. Its totient is φ = 69359390352.

The previous prime is 71286040103. The next prime is 71286040123. The reversal of 71286040121 is 12104068217.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12104068217 = 17761 ⋅681497.

It can be written as a sum of positive squares in 2 ways, for example, as 61127617600 + 10158422521 = 247240^2 + 100789^2 .

It is a cyclic number.

It is not a de Polignac number, because 71286040121 - 2⁶ = 71286040057 is a prime.

It is a super-2 number, since 2×71286040121² (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 (71286040123) 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, 963324830 + ... + 963324903.

It is an arithmetic number, because the mean of its divisors is an integer number (18303172473).

Almost surely, 2^71286040121 is an apocalyptic number.

It is an amenable number.

71286040121 is a deficient number, since it is larger than the sum of its proper divisors (1926649771).

71286040121 is a wasteful number, since it uses less digits than its factorization.

71286040121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1926649770.

The product of its (nonzero) digits is 5376, while the sum is 32.

The spelling of 71286040121 in words is "seventy-one billion, two hundred eighty-six million, forty thousand, one hundred twenty-one".