71374850821 has 2 divisors, whose sum is σ = 71374850822. Its totient is φ = 71374850820.

The previous prime is 71374850801. The next prime is 71374850849. The reversal of 71374850821 is 12805847317.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71174769796 + 200081025 = 266786^2 + 14145^2 .

It is an emirp because it is prime and its reverse (12805847317) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71374850821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71374850801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35687425410 + 35687425411.

It is an arithmetic number, because the mean of its divisors is an integer number (35687425411).

Almost surely, 2^71374850821 is an apocalyptic number.

It is an amenable number.

71374850821 is a deficient number, since it is larger than the sum of its proper divisors (1).

71374850821 is an equidigital number, since it uses as much as digits as its factorization.

71374850821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 376320, while the sum is 46.

The spelling of 71374850821 in words is "seventy-one billion, three hundred seventy-four million, eight hundred fifty thousand, eight hundred twenty-one".