71425021 has 6 divisors (see below), whose sum is σ = 73126590. Its totient is φ = 69762168.

The previous prime is 71425001. The next prime is 71425027. The reversal of 71425021 is 12052417.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 41602500 + 29822521 = 6450^2 + 5461^2 .

It is not a de Polignac number, because 71425021 - 2⁵ = 71424989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71424983 and 71425001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71425027) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17466 + ... + 21163.

It is an arithmetic number, because the mean of its divisors is an integer number (12187765).

Almost surely, 2^71425021 is an apocalyptic number.

It is an amenable number.

71425021 is a deficient number, since it is larger than the sum of its proper divisors (1701569).

71425021 is an equidigital number, since it uses as much as digits as its factorization.

71425021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38715 (or 38672 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 71425021 is about 8451.3324984880. The cubic root of 71425021 is about 414.9063920096.

Adding to 71425021 its reverse (12052417), we get a palindrome (83477438).

The spelling of 71425021 in words is "seventy-one million, four hundred twenty-five thousand, twenty-one".