71721323 has 4 divisors (see below), whose sum is σ = 72150960. Its totient is φ = 71291688.

The previous prime is 71721319. The next prime is 71721343. The reversal of 71721323 is 32312717.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32312717 = 1433 ⋅22549.

It is a cyclic number.

It is not a de Polignac number, because 71721323 - 2² = 71721319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71721292 and 71721301.

It is not an unprimeable number, because it can be changed into a prime (71721313) 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, 214568 + ... + 214901.

It is an arithmetic number, because the mean of its divisors is an integer number (18037740).

Almost surely, 2^71721323 is an apocalyptic number.

71721323 is a deficient number, since it is larger than the sum of its proper divisors (429637).

71721323 is a wasteful number, since it uses less digits than its factorization.

71721323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429636.

The product of its digits is 1764, while the sum is 26.

The square root of 71721323 is about 8468.8442540880. The cubic root of 71721323 is about 415.4793377517.

The spelling of 71721323 in words is "seventy-one million, seven hundred twenty-one thousand, three hundred twenty-three".