225135235106021 has 4 divisors (see below), whose sum is σ = 225191224972044. Its totient is φ = 225079245240000.

The previous prime is 225135235105997. The next prime is 225135235106051. The reversal of 225135235106021 is 120601532531522.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14844923173921 + 210290311932100 = 3852911^2 + 14501390^2 .

It is a cyclic number.

It is not a de Polignac number, because 225135235106021 - 2¹⁸ = 225135234843877 is a prime.

It is a super-2 number, since 2×225135235106021² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225135235106051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27994926980 + ... + 27994935021.

It is an arithmetic number, because the mean of its divisors is an integer number (56297806243011).

Almost surely, 2^{225135235106021} is an apocalyptic number.

It is an amenable number.

225135235106021 is a deficient number, since it is larger than the sum of its proper divisors (55989866023).

225135235106021 is an equidigital number, since it uses as much as digits as its factorization.

225135235106021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55989866022.

The product of its (nonzero) digits is 108000, while the sum is 38.

Adding to 225135235106021 its reverse (120601532531522), we get a palindrome (345736767637543).

The spelling of 225135235106021 in words is "two hundred twenty-five trillion, one hundred thirty-five billion, two hundred thirty-five million, one hundred six thousand, twenty-one".