71473021 has 4 divisors (see below), whose sum is σ = 71524672. Its totient is φ = 71421372.

The previous prime is 71473019. The next prime is 71473093. The reversal of 71473021 is 12037417.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71473021 - 2¹ = 71473019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71473621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23691 + ... + 26536.

It is an arithmetic number, because the mean of its divisors is an integer number (17881168).

Almost surely, 2^71473021 is an apocalyptic number.

It is an amenable number.

71473021 is a deficient number, since it is larger than the sum of its proper divisors (51651).

71473021 is a wasteful number, since it uses less digits than its factorization.

71473021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51650.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 71473021 is about 8454.1718104141. The cubic root of 71473021 is about 414.9993148486. Note that the first 3 decimals are identical.

The spelling of 71473021 in words is "seventy-one million, four hundred seventy-three thousand, twenty-one".