71265921 has 16 divisors (see below), whose sum is σ = 102953664. Its totient is φ = 43674624.

The previous prime is 71265919. The next prime is 71265947. The reversal of 71265921 is 12956217.

It is not a de Polignac number, because 71265921 - 2¹ = 71265919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71265991) 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, 14056 + ... + 18441.

It is an arithmetic number, because the mean of its divisors is an integer number (6434604).

Almost surely, 2^71265921 is an apocalyptic number.

It is an amenable number.

71265921 is a deficient number, since it is larger than the sum of its proper divisors (31687743).

71265921 is a wasteful number, since it uses less digits than its factorization.

71265921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32560.

The product of its digits is 7560, while the sum is 33.

The square root of 71265921 is about 8441.9145340379. The cubic root of 71265921 is about 414.5980935047.

The spelling of 71265921 in words is "seventy-one million, two hundred sixty-five thousand, nine hundred twenty-one".