221163925 has 6 divisors (see below), whose sum is σ = 274243298. Its totient is φ = 176931120.

The previous prime is 221163893. The next prime is 221163941. The reversal of 221163925 is 529361122.

It can be written as a sum of positive squares in 3 ways, for example, as 4691556 + 216472369 = 2166^2 + 14713^2 .

It is not a de Polignac number, because 221163925 - 2⁵ = 221163893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4423254 + ... + 4423303.

Almost surely, 2^221163925 is an apocalyptic number.

221163925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221163925 is a deficient number, since it is larger than the sum of its proper divisors (53079373).

221163925 is an equidigital number, since it uses as much as digits as its factorization.

221163925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8846567 (or 8846562 counting only the distinct ones).

The product of its digits is 6480, while the sum is 31.

The square root of 221163925 is about 14871.5811197061. The cubic root of 221163925 is about 604.7438070164.

The spelling of 221163925 in words is "two hundred twenty-one million, one hundred sixty-three thousand, nine hundred twenty-five".