71339761421 has 4 divisors (see below), whose sum is σ = 73079755644. Its totient is φ = 69599767200.

The previous prime is 71339761403. The next prime is 71339761447. The reversal of 71339761421 is 12416793317.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12416793317 = 23 ⋅539860579.

It can be written as a sum of positive squares in 2 ways, for example, as 25325221321 + 46014540100 = 159139^2 + 214510^2 .

It is a cyclic number.

It is not a de Polignac number, because 71339761421 - 2¹⁸ = 71339499277 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 (71339761621) 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, 869997050 + ... + 869997131.

It is an arithmetic number, because the mean of its divisors is an integer number (18269938911).

Almost surely, 2^71339761421 is an apocalyptic number.

It is an amenable number.

71339761421 is a deficient number, since it is larger than the sum of its proper divisors (1739994223).

71339761421 is a wasteful number, since it uses less digits than its factorization.

71339761421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1739994222.

The product of its digits is 190512, while the sum is 44.

The spelling of 71339761421 in words is "seventy-one billion, three hundred thirty-nine million, seven hundred sixty-one thousand, four hundred twenty-one".