72222171 has 32 divisors (see below), whose sum is σ = 117739008. Its totient is φ = 38438400.

The previous prime is 72222169. The next prime is 72222179. The reversal of 72222171 is 17122227.

72222171 is a nontrivial binomial coefficient, being equal to C(12019, 2).

It is not a de Polignac number, because 72222171 - 2¹ = 72222169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72222179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35056 + ... + 37058.

It is an arithmetic number, because the mean of its divisors is an integer number (3679344).

Almost surely, 2^72222171 is an apocalyptic number.

72222171 is the 12018-th triangular number.

72222171 is a deficient number, since it is larger than the sum of its proper divisors (45516837).

72222171 is a wasteful number, since it uses less digits than its factorization.

72222171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2131.

The product of its digits is 784, while the sum is 24.

The square root of 72222171 is about 8498.3628423362. The cubic root of 72222171 is about 416.4442273687. Note that the first 3 decimals are identical.

Adding to 72222171 its reverse (17122227), we get a palindrome (89344398).

The spelling of 72222171 in words is "seventy-two million, two hundred twenty-two thousand, one hundred seventy-one".