216621883 has 2 divisors, whose sum is σ = 216621884. Its totient is φ = 216621882.

The previous prime is 216621877. The next prime is 216621887. The reversal of 216621883 is 388126612.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216621883 is a prime.

It is not a weakly prime, because it can be changed into another prime (216621887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108310941 + 108310942.

It is an arithmetic number, because the mean of its divisors is an integer number (108310942).

Almost surely, 2^216621883 is an apocalyptic number.

216621883 is a deficient number, since it is larger than the sum of its proper divisors (1).

216621883 is an equidigital number, since it uses as much as digits as its factorization.

216621883 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 37.

The square root of 216621883 is about 14718.0801397465. The cubic root of 216621883 is about 600.5752658650.

The spelling of 216621883 in words is "two hundred sixteen million, six hundred twenty-one thousand, eight hundred eighty-three".