1221903425 has 6 divisors (see below), whose sum is σ = 1515160278. Its totient is φ = 977522720.

The previous prime is 1221903413. The next prime is 1221903427. The reversal of 1221903425 is 5243091221.

It can be written as a sum of positive squares in 3 ways, for example, as 261121 + 1221642304 = 511^2 + 34952^2 .

It is not a de Polignac number, because 1221903425 - 2²⁸ = 953467969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221903427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24438044 + ... + 24438093.

It is an arithmetic number, because the mean of its divisors is an integer number (252526713).

Almost surely, 2^1221903425 is an apocalyptic number.

It is an amenable number.

1221903425 is a deficient number, since it is larger than the sum of its proper divisors (293256853).

1221903425 is an equidigital number, since it uses as much as digits as its factorization.

1221903425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48876147 (or 48876142 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1221903425 is about 34955.7352232792. The cubic root of 1221903425 is about 1069.0851425483.

Adding to 1221903425 its reverse (5243091221), we get a palindrome (6464994646).

The spelling of 1221903425 in words is "one billion, two hundred twenty-one million, nine hundred three thousand, four hundred twenty-five".