221106025 has 12 divisors (see below), whose sum is σ = 313339072. Its totient is φ = 151615440.

The previous prime is 221105987. The next prime is 221106031. The reversal of 221106025 is 520601122.

It is not a de Polignac number, because 221106025 - 2⁹ = 221105513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221105993 and 221106011.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 631557 + ... + 631906.

Almost surely, 2^221106025 is an apocalyptic number.

221106025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221106025 is a deficient number, since it is larger than the sum of its proper divisors (92233047).

221106025 is a wasteful number, since it uses less digits than its factorization.

221106025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1263480 (or 1263475 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 221106025 is about 14869.6343263713. The cubic root of 221106025 is about 604.6910290865.

Adding to 221106025 its reverse (520601122), we get a palindrome (741707147).

The spelling of 221106025 in words is "two hundred twenty-one million, one hundred six thousand, twenty-five".