225150042421 has 2 divisors, whose sum is σ = 225150042422. Its totient is φ = 225150042420.

The previous prime is 225150042419. The next prime is 225150042433. The reversal of 225150042421 is 124240051522.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123573340900 + 101576701521 = 351530^2 + 318711^2 .

It is a cyclic number.

It is not a de Polignac number, because 225150042421 - 2¹ = 225150042419 is a prime.

Together with 225150042419, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 225150042421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225150042521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112575021210 + 112575021211.

It is an arithmetic number, because the mean of its divisors is an integer number (112575021211).

Almost surely, 2^225150042421 is an apocalyptic number.

It is an amenable number.

225150042421 is a deficient number, since it is larger than the sum of its proper divisors (1).

225150042421 is an equidigital number, since it uses as much as digits as its factorization.

225150042421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6400, while the sum is 28.

Adding to 225150042421 its reverse (124240051522), we get a palindrome (349390093943).

The spelling of 225150042421 in words is "two hundred twenty-five billion, one hundred fifty million, forty-two thousand, four hundred twenty-one".