225421155 has 12 divisors (see below), whose sum is σ = 390730080. Its totient is φ = 120224592.

The previous prime is 225421087. The next prime is 225421159. The reversal of 225421155 is 551124522.

225421155 is a `hidden beast` number, since 2 + 2 + 542 + 115 + 5 = 666.

It is not a de Polignac number, because 225421155 - 2¹³ = 225412963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (225421159) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2504635 + ... + 2504724.

It is an arithmetic number, because the mean of its divisors is an integer number (32560840).

Almost surely, 2^225421155 is an apocalyptic number.

225421155 is a deficient number, since it is larger than the sum of its proper divisors (165308925).

225421155 is a wasteful number, since it uses less digits than its factorization.

225421155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5009370 (or 5009367 counting only the distinct ones).

The product of its digits is 4000, while the sum is 27.

The square root of 225421155 is about 15014.0319368250. The cubic root of 225421155 is about 608.5994518840.

Adding to 225421155 its reverse (551124522), we get a palindrome (776545677).

It can be divided in two parts, 2254 and 21155, that added together give a square (23409 = 153²).

The spelling of 225421155 in words is "two hundred twenty-five million, four hundred twenty-one thousand, one hundred fifty-five".