216912425 has 48 divisors (see below), whose sum is σ = 297504768. Its totient is φ = 156340800.

The previous prime is 216912407. The next prime is 216912457. The reversal of 216912425 is 524219612.

It is not a de Polignac number, because 216912425 - 2²⁴ = 200135209 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 216912391 and 216912400.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 766334 + ... + 766616.

It is an arithmetic number, because the mean of its divisors is an integer number (6198016).

Almost surely, 2^216912425 is an apocalyptic number.

216912425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216912425 is a deficient number, since it is larger than the sum of its proper divisors (80592343).

216912425 is a wasteful number, since it uses less digits than its factorization.

216912425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390 (or 385 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 216912425 is about 14727.9470735062. The cubic root of 216912425 is about 600.8436511615.

The spelling of 216912425 in words is "two hundred sixteen million, nine hundred twelve thousand, four hundred twenty-five".