216621367 has 2 divisors, whose sum is σ = 216621368. Its totient is φ = 216621366.

The previous prime is 216621311. The next prime is 216621373. The reversal of 216621367 is 763126612.

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-216621367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216621767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108310683 + 108310684.

It is an arithmetic number, because the mean of its divisors is an integer number (108310684).

Almost surely, 2^216621367 is an apocalyptic number.

216621367 is a deficient number, since it is larger than the sum of its proper divisors (1).

216621367 is an equidigital number, since it uses as much as digits as its factorization.

216621367 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 34.

The square root of 216621367 is about 14718.0626102759. The cubic root of 216621367 is about 600.5747890017.

Adding to 216621367 its reverse (763126612), we get a palindrome (979747979).

The spelling of 216621367 in words is "two hundred sixteen million, six hundred twenty-one thousand, three hundred sixty-seven".