216020425 has 6 divisors (see below), whose sum is σ = 267865358. Its totient is φ = 172816320.

The previous prime is 216020419. The next prime is 216020447. The reversal of 216020425 is 524020612.

It can be written as a sum of positive squares in 3 ways, for example, as 2042041 + 213978384 = 1429^2 + 14628^2 .

It is not a de Polignac number, because 216020425 - 2⁷ = 216020297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216020396 and 216020405.

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 4320384 + ... + 4320433.

Almost surely, 2^216020425 is an apocalyptic number.

216020425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216020425 is a deficient number, since it is larger than the sum of its proper divisors (51844933).

216020425 is an equidigital number, since it uses as much as digits as its factorization.

216020425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8640827 (or 8640822 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 216020425 is about 14697.6333128841. The cubic root of 216020425 is about 600.0189114410.

The spelling of 216020425 in words is "two hundred sixteen million, twenty thousand, four hundred twenty-five".