221427625 has 8 divisors (see below), whose sum is σ = 276341832. Its totient is φ = 177142000.

The previous prime is 221427611. The next prime is 221427641. The reversal of 221427625 is 526724122.

It can be written as a sum of positive squares in 4 ways, for example, as 16451136 + 204976489 = 4056^2 + 14317^2 .

It is not a de Polignac number, because 221427625 - 2⁹ = 221427113 is a prime.

It is a super-2 number, since 2×221427625² = 98060386226281250, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 885586 + ... + 885835.

It is an arithmetic number, because the mean of its divisors is an integer number (34542729).

Almost surely, 2^221427625 is an apocalyptic number.

221427625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221427625 is a deficient number, since it is larger than the sum of its proper divisors (54914207).

221427625 is an equidigital number, since it uses as much as digits as its factorization.

221427625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1771436 (or 1771426 counting only the distinct ones).

The product of its digits is 13440, while the sum is 31.

The square root of 221427625 is about 14880.4443818053. Note that the first 3 decimals coincide. The cubic root of 221427625 is about 604.9840625995.

The spelling of 221427625 in words is "two hundred twenty-one million, four hundred twenty-seven thousand, six hundred twenty-five".