72150222221 has 8 divisors (see below), whose sum is σ = 89953523904. Its totient is φ = 56220952320.

The previous prime is 72150222187. The next prime is 72150222247. The reversal of 72150222221 is 12222205127.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72150222221 - 2¹⁴ = 72150205837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72150222281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 468507860 + ... + 468508013.

It is an arithmetic number, because the mean of its divisors is an integer number (11244190488).

Almost surely, 2^72150222221 is an apocalyptic number.

It is an amenable number.

72150222221 is a deficient number, since it is larger than the sum of its proper divisors (17803301683).

72150222221 is a wasteful number, since it uses less digits than its factorization.

72150222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 937015891.

The product of its (nonzero) digits is 2240, while the sum is 26.

Adding to 72150222221 its reverse (12222205127), we get a palindrome (84372427348).

The spelling of 72150222221 in words is "seventy-two billion, one hundred fifty million, two hundred twenty-two thousand, two hundred twenty-one".