216090397429 has 2 divisors, whose sum is σ = 216090397430. Its totient is φ = 216090397428.

The previous prime is 216090397403. The next prime is 216090397441. The reversal of 216090397429 is 924793090612.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194570974404 + 21519423025 = 441102^2 + 146695^2 .

It is a cyclic number.

It is not a de Polignac number, because 216090397429 - 2²⁵ = 216056842997 is a prime.

It is a super-2 number, since 2×216090397429² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216090397129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108045198714 + 108045198715.

It is an arithmetic number, because the mean of its divisors is an integer number (108045198715).

Almost surely, 2^216090397429 is an apocalyptic number.

It is an amenable number.

216090397429 is a deficient number, since it is larger than the sum of its proper divisors (1).

216090397429 is an equidigital number, since it uses as much as digits as its factorization.

216090397429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1469664, while the sum is 52.

The spelling of 216090397429 in words is "two hundred sixteen billion, ninety million, three hundred ninety-seven thousand, four hundred twenty-nine".