216922331 has 2 divisors, whose sum is σ = 216922332. Its totient is φ = 216922330.

The previous prime is 216922319. The next prime is 216922337. The reversal of 216922331 is 133229612.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216922331 is a prime.

It is a super-2 number, since 2×216922331² = 94110595372947122, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 216922294 and 216922303.

It is not a weakly prime, because it can be changed into another prime (216922337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108461165 + 108461166.

It is an arithmetic number, because the mean of its divisors is an integer number (108461166).

Almost surely, 2^216922331 is an apocalyptic number.

216922331 is a deficient number, since it is larger than the sum of its proper divisors (1).

216922331 is an equidigital number, since it uses as much as digits as its factorization.

216922331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 29.

The square root of 216922331 is about 14728.2833690828. The cubic root of 216922331 is about 600.8527975049.

The spelling of 216922331 in words is "two hundred sixteen million, nine hundred twenty-two thousand, three hundred thirty-one".