72221443 has 12 divisors (see below), whose sum is σ = 84303912. Its totient is φ = 61689600.

The previous prime is 72221441. The next prime is 72221473. The reversal of 72221443 is 34412227.

It is a happy number.

It is not a de Polignac number, because 72221443 - 2¹ = 72221441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72221441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12643 + ... + 17443.

It is an arithmetic number, because the mean of its divisors is an integer number (7025326).

Almost surely, 2^72221443 is an apocalyptic number.

72221443 is a deficient number, since it is larger than the sum of its proper divisors (12082469).

72221443 is a wasteful number, since it uses less digits than its factorization.

72221443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5122 (or 5115 counting only the distinct ones).

The product of its digits is 2688, while the sum is 25.

The square root of 72221443 is about 8498.3200104491. The cubic root of 72221443 is about 416.4428281104.

The spelling of 72221443 in words is "seventy-two million, two hundred twenty-one thousand, four hundred forty-three".