225254427421 has 8 divisors (see below), whose sum is σ = 233117512920. Its totient is φ = 217397721408.

The previous prime is 225254427407. The next prime is 225254427487. The reversal of 225254427421 is 124724452522.

It can be written as a sum of positive squares in 4 ways, for example, as 22381656025 + 202872771396 = 149605^2 + 450414^2 .

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

It is not a de Polignac number, because 225254427421 - 2¹¹ = 225254425373 is a prime.

It is a super-2 number, since 2×225254427421² (a number of 24 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 (225254427121) 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, 1522966 + ... + 1664311.

It is an arithmetic number, because the mean of its divisors is an integer number (29139689115).

Almost surely, 2^225254427421 is an apocalyptic number.

It is an amenable number.

225254427421 is a deficient number, since it is larger than the sum of its proper divisors (7863085499).

225254427421 is a wasteful number, since it uses less digits than its factorization.

225254427421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3189743.

The product of its digits is 358400, while the sum is 40.

Adding to 225254427421 its reverse (124724452522), we get a palindrome (349978879943).

The spelling of 225254427421 in words is "two hundred twenty-five billion, two hundred fifty-four million, four hundred twenty-seven thousand, four hundred twenty-one".