71221104541 has 2 divisors, whose sum is σ = 71221104542. Its totient is φ = 71221104540.

The previous prime is 71221104517. The next prime is 71221104557. The reversal of 71221104541 is 14540112217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39212316441 + 32008788100 = 198021^2 + 178910^2 .

It is a cyclic number.

It is not a de Polignac number, because 71221104541 - 2⁵ = 71221104509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71221104571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35610552270 + 35610552271.

It is an arithmetic number, because the mean of its divisors is an integer number (35610552271).

Almost surely, 2^71221104541 is an apocalyptic number.

It is an amenable number.

71221104541 is a deficient number, since it is larger than the sum of its proper divisors (1).

71221104541 is an equidigital number, since it uses as much as digits as its factorization.

71221104541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 28.

Adding to 71221104541 its reverse (14540112217), we get a palindrome (85761216758).

The spelling of 71221104541 in words is "seventy-one billion, two hundred twenty-one million, one hundred four thousand, five hundred forty-one".