225420123 has 16 divisors (see below), whose sum is σ = 316771200. Its totient is φ = 142194240.

The previous prime is 225420109. The next prime is 225420137. The reversal of 225420123 is 321024522.

It is an interprime number because it is at equal distance from previous prime (225420109) and next prime (225420137).

It is not a de Polignac number, because 225420123 - 2⁶ = 225420059 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 225420123.

It is not an unprimeable number, because it can be changed into a prime (225420823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56143 + ... + 60023.

It is an arithmetic number, because the mean of its divisors is an integer number (19798200).

Almost surely, 2^225420123 is an apocalyptic number.

225420123 is a deficient number, since it is larger than the sum of its proper divisors (91351077).

225420123 is a wasteful number, since it uses less digits than its factorization.

225420123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4922.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 225420123 is about 15013.9975689355. The cubic root of 225420123 is about 608.5985231401.

Adding to 225420123 its reverse (321024522), we get a palindrome (546444645).

The spelling of 225420123 in words is "two hundred twenty-five million, four hundred twenty thousand, one hundred twenty-three".