71135344349021 has 2 divisors, whose sum is σ = 71135344349022. Its totient is φ = 71135344349020.

The previous prime is 71135344349009. The next prime is 71135344349189. The reversal of 71135344349021 is 12094344353117.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71081002212025 + 54342136996 = 8430955^2 + 233114^2 .

It is a cyclic number.

It is not a de Polignac number, because 71135344349021 - 2²² = 71135340154717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71135344348021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35567672174510 + 35567672174511.

It is an arithmetic number, because the mean of its divisors is an integer number (35567672174511).

Almost surely, 2^{71135344349021} is an apocalyptic number.

It is an amenable number.

71135344349021 is a deficient number, since it is larger than the sum of its proper divisors (1).

71135344349021 is an equidigital number, since it uses as much as digits as its factorization.

71135344349021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 47.

The spelling of 71135344349021 in words is "seventy-one trillion, one hundred thirty-five billion, three hundred forty-four million, three hundred forty-nine thousand, twenty-one".