71221357 has 2 divisors, whose sum is σ = 71221358. Its totient is φ = 71221356.

The previous prime is 71221351. The next prime is 71221379. The reversal of 71221357 is 75312217.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36893476 + 34327881 = 6074^2 + 5859^2 .

It is a cyclic number.

It is not a de Polignac number, because 71221357 - 2³ = 71221349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71221351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35610678 + 35610679.

It is an arithmetic number, because the mean of its divisors is an integer number (35610679).

Almost surely, 2^71221357 is an apocalyptic number.

It is an amenable number.

71221357 is a deficient number, since it is larger than the sum of its proper divisors (1).

71221357 is an equidigital number, since it uses as much as digits as its factorization.

71221357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2940, while the sum is 28.

The square root of 71221357 is about 8439.2746726244. The cubic root of 71221357 is about 414.5116566698.

The spelling of 71221357 in words is "seventy-one million, two hundred twenty-one thousand, three hundred fifty-seven".