221151025 has 12 divisors (see below), whose sum is σ = 275431900. Its totient is φ = 176143680.

The previous prime is 221151019. The next prime is 221151037. The reversal of 221151025 is 520151122.

It can be written as a sum of positive squares in 6 ways, for example, as 8020224 + 213130801 = 2832^2 + 14599^2 .

It is not a de Polignac number, because 221151025 - 2²¹ = 219053873 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221150993 and 221151011.

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, 13590 + ... + 25039.

Almost surely, 2^221151025 is an apocalyptic number.

221151025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221151025 is a deficient number, since it is larger than the sum of its proper divisors (54280875).

221151025 is a wasteful number, since it uses less digits than its factorization.

221151025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38868 (or 38863 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 221151025 is about 14871.1474002513. The cubic root of 221151025 is about 604.7320490006.

The spelling of 221151025 in words is "two hundred twenty-one million, one hundred fifty-one thousand, twenty-five".