71070021 has 32 divisors (see below), whose sum is σ = 115415040. Its totient is φ = 42865200.

The previous prime is 71070019. The next prime is 71070029. The reversal of 71070021 is 12007017.

It is not a de Polignac number, because 71070021 - 2¹ = 71070019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71069976 and 71070003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71070029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 80046 + ... + 80928.

It is an arithmetic number, because the mean of its divisors is an integer number (3606720).

Almost surely, 2^71070021 is an apocalyptic number.

It is an amenable number.

71070021 is a deficient number, since it is larger than the sum of its proper divisors (44345019).

71070021 is a wasteful number, since it uses less digits than its factorization.

71070021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174 (or 1168 counting only the distinct ones).

The product of its (nonzero) digits is 98, while the sum is 18.

The square root of 71070021 is about 8430.3037311831. The cubic root of 71070021 is about 414.2178542552.

Adding to 71070021 its reverse (12007017), we get a palindrome (83077038).

The spelling of 71070021 in words is "seventy-one million, seventy thousand, twenty-one".