216221675 has 6 divisors (see below), whose sum is σ = 268114908. Its totient is φ = 172977320.

The previous prime is 216221647. The next prime is 216221699. The reversal of 216221675 is 576122612.

It is not a de Polignac number, because 216221675 - 2⁶ = 216221611 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 4324409 + ... + 4324458.

It is an arithmetic number, because the mean of its divisors is an integer number (44685818).

Almost surely, 2^216221675 is an apocalyptic number.

216221675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

216221675 is a deficient number, since it is larger than the sum of its proper divisors (51893233).

216221675 is an equidigital number, since it uses as much as digits as its factorization.

216221675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8648877 (or 8648872 counting only the distinct ones).

The product of its digits is 10080, while the sum is 32.

The square root of 216221675 is about 14704.4780594212. The cubic root of 216221675 is about 600.2051844539.

The spelling of 216221675 in words is "two hundred sixteen million, two hundred twenty-one thousand, six hundred seventy-five".