71721322 has 4 divisors (see below), whose sum is σ = 107581986. Its totient is φ = 35860660.

The previous prime is 71721319. The next prime is 71721343. The reversal of 71721322 is 22312717.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22312717 = 7 ⋅3187531.

It can be written as a sum of positive squares in only one way, i.e., 48594841 + 23126481 = 6971^2 + 4809^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17930329 + ... + 17930332.

Almost surely, 2^71721322 is an apocalyptic number.

71721322 is a deficient number, since it is larger than the sum of its proper divisors (35860664).

71721322 is a wasteful number, since it uses less digits than its factorization.

71721322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35860663.

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

The square root of 71721322 is about 8468.8441950481. The cubic root of 71721322 is about 415.4793358207.

The spelling of 71721322 in words is "seventy-one million, seven hundred twenty-one thousand, three hundred twenty-two".