216222724 has 24 divisors (see below), whose sum is σ = 408461760. Its totient is φ = 99843744.

The previous prime is 216222703. The next prime is 216222739. The reversal of 216222724 is 427222612.

It is a junction number, because it is equal to n+sod(n) for n = 216222692 and 216222701.

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 in 7 ways as a sum of consecutive naturals, for example, 37854 + ... + 43189.

It is an arithmetic number, because the mean of its divisors is an integer number (17019240).

Almost surely, 2^216222724 is an apocalyptic number.

It is an amenable number.

216222724 is a deficient number, since it is larger than the sum of its proper divisors (192239036).

216222724 is a wasteful number, since it uses less digits than its factorization.

216222724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81099 (or 81097 counting only the distinct ones).

The product of its digits is 5376, while the sum is 28.

The square root of 216222724 is about 14704.5137287841. The cubic root of 216222724 is about 600.2061550846.

The spelling of 216222724 in words is "two hundred sixteen million, two hundred twenty-two thousand, seven hundred twenty-four".