1221442204225 has 48 divisors (see below), whose sum is σ = 1643729044608. Its totient is φ = 896915901440.

The previous prime is 1221442204223. The next prime is 1221442204247. The reversal of 1221442204225 is 5224022441221.

It is not a de Polignac number, because 1221442204225 - 2¹ = 1221442204223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221442204223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3599322 + ... + 3924028.

It is an arithmetic number, because the mean of its divisors is an integer number (34244355096).

Almost surely, 2^{1221442204225} is an apocalyptic number.

It is an amenable number.

1221442204225 is a deficient number, since it is larger than the sum of its proper divisors (422286840383).

1221442204225 is a wasteful number, since it uses less digits than its factorization.

1221442204225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324954 (or 324949 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 31.

Adding to 1221442204225 its reverse (5224022441221), we get a palindrome (6445464645446).

The spelling of 1221442204225 in words is "one trillion, two hundred twenty-one billion, four hundred forty-two million, two hundred four thousand, two hundred twenty-five".