71421013 has 2 divisors, whose sum is σ = 71421014. Its totient is φ = 71421012.

The previous prime is 71421011. The next prime is 71421023. The reversal of 71421013 is 31012417.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36457444 + 34963569 = 6038^2 + 5913^2 .

It is a cyclic number.

It is not a de Polignac number, because 71421013 - 2¹ = 71421011 is a prime.

It is a super-2 number, since 2×71421013² = 10201922195892338, which contains 22 as substring.

Together with 71421011, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71421011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35710506 + 35710507.

It is an arithmetic number, because the mean of its divisors is an integer number (35710507).

Almost surely, 2^71421013 is an apocalyptic number.

It is an amenable number.

71421013 is a deficient number, since it is larger than the sum of its proper divisors (1).

71421013 is an equidigital number, since it uses as much as digits as its factorization.

71421013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 71421013 is about 8451.0953727904. The cubic root of 71421013 is about 414.8986310695.

The spelling of 71421013 in words is "seventy-one million, four hundred twenty-one thousand, thirteen".