225451002421 has 2 divisors, whose sum is σ = 225451002422. Its totient is φ = 225451002420.

The previous prime is 225451002409. The next prime is 225451002479. The reversal of 225451002421 is 124200154522.

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., 137070252900 + 88380749521 = 370230^2 + 297289^2 .

It is a cyclic number.

It is not a de Polignac number, because 225451002421 - 2¹⁹ = 225450478133 is a prime.

It is a super-2 number, since 2×225451002421² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 225451002421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225451002221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112725501210 + 112725501211.

It is an arithmetic number, because the mean of its divisors is an integer number (112725501211).

Almost surely, 2^225451002421 is an apocalyptic number.

It is an amenable number.

225451002421 is a deficient number, since it is larger than the sum of its proper divisors (1).

225451002421 is an equidigital number, since it uses as much as digits as its factorization.

225451002421 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 225451002421 its reverse (124200154522), we get a palindrome (349651156943).

The spelling of 225451002421 in words is "two hundred twenty-five billion, four hundred fifty-one million, two thousand, four hundred twenty-one".