1225444445221 has 2 divisors, whose sum is σ = 1225444445222. Its totient is φ = 1225444445220.

The previous prime is 1225444445209. The next prime is 1225444445297.

1225444445221 is nontrivially palindromic in base 10.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 872001116100 + 353443329121 = 933810^2 + 594511^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 1225444445221 - 2⁹ = 1225444444709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1225444445021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612722222610 + 612722222611.

It is an arithmetic number, because the mean of its divisors is an integer number (612722222611).

Almost surely, 2^{1225444445221} is an apocalyptic number.

It is an amenable number.

1225444445221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225444445221 is an equidigital number, since it uses as much as digits as its factorization.

1225444445221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 409600, while the sum is 40.

The spelling of 1225444445221 in words is "one trillion, two hundred twenty-five billion, four hundred forty-four million, four hundred forty-five thousand, two hundred twenty-one".