221833025 has 6 divisors (see below), whose sum is σ = 275072982. Its totient is φ = 177466400.

The previous prime is 221832991. The next prime is 221833049. The reversal of 221833025 is 520338122.

221833025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 41011216 + 180821809 = 6404^2 + 13447^2 .

It is a de Polignac number, because none of the positive numbers 2^k-221833025 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221832985 and 221833003.

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, 4436636 + ... + 4436685.

It is an arithmetic number, because the mean of its divisors is an integer number (45845497).

Almost surely, 2^221833025 is an apocalyptic number.

221833025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221833025 is a deficient number, since it is larger than the sum of its proper divisors (53239957).

221833025 is an equidigital number, since it uses as much as digits as its factorization.

221833025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8873331 (or 8873326 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 221833025 is about 14894.0600576203. The cubic root of 221833025 is about 605.3530484972.

The spelling of 221833025 in words is "two hundred twenty-one million, eight hundred thirty-three thousand, twenty-five".