71151021 has 16 divisors (see below), whose sum is σ = 105549120. Its totient is φ = 47370960.

The previous prime is 71151013. The next prime is 71151023. The reversal of 71151021 is 12015117.

It is a happy number.

It is not a de Polignac number, because 71151021 - 2³ = 71151013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71150985 and 71151003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71151023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28306 + ... + 30716.

It is an arithmetic number, because the mean of its divisors is an integer number (6596820).

Almost surely, 2^71151021 is an apocalyptic number.

It is an amenable number.

71151021 is a deficient number, since it is larger than the sum of its proper divisors (34398099).

71151021 is a wasteful number, since it uses less digits than its factorization.

71151021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3513 (or 3507 counting only the distinct ones).

The product of its (nonzero) digits is 70, while the sum is 18.

The square root of 71151021 is about 8435.1064605018. The cubic root of 71151021 is about 414.3751587805.

Adding to 71151021 its reverse (12015117), we get a palindrome (83166138).

The spelling of 71151021 in words is "seventy-one million, one hundred fifty-one thousand, twenty-one".