221826025 has 6 divisors (see below), whose sum is σ = 275064302. Its totient is φ = 177460800.

The previous prime is 221826001. The next prime is 221826029. The reversal of 221826025 is 520628122.

It can be written as a sum of positive squares in 3 ways, for example, as 47665216 + 174160809 = 6904^2 + 13197^2 .

It is not a de Polignac number, because 221826025 - 2¹³ = 221817833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221825984 and 221826002.

It is not an unprimeable number, because it can be changed into a prime (221826029) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4436496 + ... + 4436545.

Almost surely, 2^221826025 is an apocalyptic number.

221826025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221826025 is a deficient number, since it is larger than the sum of its proper divisors (53238277).

221826025 is an equidigital number, since it uses as much as digits as its factorization.

221826025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8873051 (or 8873046 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 221826025 is about 14893.8250627567. The cubic root of 221826025 is about 605.3466810715.

The spelling of 221826025 in words is "two hundred twenty-one million, eight hundred twenty-six thousand, twenty-five".