216311025 has 48 divisors (see below), whose sum is σ = 421941248. Its totient is φ = 95688000.

The previous prime is 216310981. The next prime is 216311033. The reversal of 216311025 is 520113612.

216311025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 216311025 - 2⁶ = 216310961 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 216310992 and 216311010.

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, 9630 + ... + 22920.

Almost surely, 2^216311025 is an apocalyptic number.

216311025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216311025 is a deficient number, since it is larger than the sum of its proper divisors (205630223).

216311025 is a wasteful number, since it uses less digits than its factorization.

216311025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13342 (or 13337 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 216311025 is about 14707.5159357384. The cubic root of 216311025 is about 600.2878479949.

Adding to 216311025 its reverse (520113612), we get a palindrome (736424637).

The spelling of 216311025 in words is "two hundred sixteen million, three hundred eleven thousand, twenty-five".