218216972 has 12 divisors (see below), whose sum is σ = 392201040. Its totient is φ = 106159536.

The previous prime is 218216951. The next prime is 218216983. The reversal of 218216972 is 279612812.

218216972 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 3 ways as a sum of consecutive naturals, for example, 737072 + ... + 737367.

It is an arithmetic number, because the mean of its divisors is an integer number (32683420).

Almost surely, 2^218216972 is an apocalyptic number.

It is an amenable number.

218216972 is a deficient number, since it is larger than the sum of its proper divisors (173984068).

218216972 is a wasteful number, since it uses less digits than its factorization.

218216972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1474480 (or 1474478 counting only the distinct ones).

The product of its digits is 24192, while the sum is 38.

The square root of 218216972 is about 14772.1688319624. The cubic root of 218216972 is about 602.0457686420.

The spelling of 218216972 in words is "two hundred eighteen million, two hundred sixteen thousand, nine hundred seventy-two".