225021401 has 24 divisors (see below), whose sum is σ = 264106080. Its totient is φ = 190903680.

The previous prime is 225021359. The next prime is 225021403. The reversal of 225021401 is 104120522.

It is not a de Polignac number, because 225021401 - 2¹⁴ = 225005017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 225021401.

It is not an unprimeable number, because it can be changed into a prime (225021403) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 285530 + ... + 286316.

It is an arithmetic number, because the mean of its divisors is an integer number (11004420).

Almost surely, 2^225021401 is an apocalyptic number.

It is an amenable number.

225021401 is a deficient number, since it is larger than the sum of its proper divisors (39084679).

225021401 is a wasteful number, since it uses less digits than its factorization.

225021401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965 (or 954 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 225021401 is about 15000.7133497044. The cubic root of 225021401 is about 608.2394826800.

Adding to 225021401 its reverse (104120522), we get a palindrome (329141923).

The spelling of 225021401 in words is "two hundred twenty-five million, twenty-one thousand, four hundred one".