225011821 has 2 divisors, whose sum is σ = 225011822. Its totient is φ = 225011820.

The previous prime is 225011807. The next prime is 225011827. The reversal of 225011821 is 128110522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152250921 + 72760900 = 12339^2 + 8530^2 .

It is a cyclic number.

It is not a de Polignac number, because 225011821 - 2⁵ = 225011789 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 225011792 and 225011801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225011827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112505910 + 112505911.

It is an arithmetic number, because the mean of its divisors is an integer number (112505911).

Almost surely, 2^225011821 is an apocalyptic number.

It is an amenable number.

225011821 is a deficient number, since it is larger than the sum of its proper divisors (1).

225011821 is an equidigital number, since it uses as much as digits as its factorization.

225011821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 225011821 is about 15000.3940281581. The cubic root of 225011821 is about 608.2308508834.

The spelling of 225011821 in words is "two hundred twenty-five million, eleven thousand, eight hundred twenty-one".