225020021 has 8 divisors (see below), whose sum is σ = 239210400. Its totient is φ = 211064400.

The previous prime is 225019999. The next prime is 225020057. The reversal of 225020021 is 120020522.

225020021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 225020021 - 2⁶ = 225019957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 225019978 and 225020005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225020071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56711 + ... + 60548.

It is an arithmetic number, because the mean of its divisors is an integer number (29901300).

Almost surely, 2^225020021 is an apocalyptic number.

It is an amenable number.

225020021 is a deficient number, since it is larger than the sum of its proper divisors (14190379).

225020021 is a wasteful number, since it uses less digits than its factorization.

225020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117379.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 225020021 is about 15000.6673518214. The cubic root of 225020021 is about 608.2382392839.

Adding to 225020021 its reverse (120020522), we get a palindrome (345040543).

The spelling of 225020021 in words is "two hundred twenty-five million, twenty thousand, twenty-one".