216220747 has 2 divisors, whose sum is σ = 216220748. Its totient is φ = 216220746.

The previous prime is 216220729. The next prime is 216220751. The reversal of 216220747 is 747022612.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216220747 is a prime.

It is a super-2 number, since 2×216220747² = 93502822866476018, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (216220717) 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 as a sum of consecutive naturals, namely, 108110373 + 108110374.

It is an arithmetic number, because the mean of its divisors is an integer number (108110374).

Almost surely, 2^216220747 is an apocalyptic number.

216220747 is a deficient number, since it is larger than the sum of its proper divisors (1).

216220747 is an equidigital number, since it uses as much as digits as its factorization.

216220747 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 216220747 is about 14704.4465043741. The cubic root of 216220747 is about 600.2043257808.

The spelling of 216220747 in words is "two hundred sixteen million, two hundred twenty thousand, seven hundred forty-seven".