71153021 has 2 divisors, whose sum is σ = 71153022. Its totient is φ = 71153020.

The previous prime is 71152993. The next prime is 71153059. The reversal of 71153021 is 12035117.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51696100 + 19456921 = 7190^2 + 4411^2 .

It is a cyclic number.

It is not a de Polignac number, because 71153021 - 2⁶ = 71152957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71152984 and 71153002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71153221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35576510 + 35576511.

It is an arithmetic number, because the mean of its divisors is an integer number (35576511).

Almost surely, 2^71153021 is an apocalyptic number.

It is an amenable number.

71153021 is a deficient number, since it is larger than the sum of its proper divisors (1).

71153021 is an equidigital number, since it uses as much as digits as its factorization.

71153021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 210, while the sum is 20.

The square root of 71153021 is about 8435.2250118180. The cubic root of 71153021 is about 414.3790413322.

Adding to 71153021 its reverse (12035117), we get a palindrome (83188138).

The spelling of 71153021 in words is "seventy-one million, one hundred fifty-three thousand, twenty-one".