1221345325 has 6 divisors (see below), whose sum is σ = 1514468234. Its totient is φ = 977076240.

The previous prime is 1221345319. The next prime is 1221345397. The reversal of 1221345325 is 5235431221.

It can be written as a sum of positive squares in 3 ways, for example, as 9400356 + 1211944969 = 3066^2 + 34813^2 .

It is not a de Polignac number, because 1221345325 - 2³ = 1221345317 is a prime.

It is a super-3 number, since 3×1221345325³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221345293 and 1221345302.

It is a congruent number.

It is an unprimeable number.

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, 24426882 + ... + 24426931.

Almost surely, 2^1221345325 is an apocalyptic number.

It is an amenable number.

1221345325 is a deficient number, since it is larger than the sum of its proper divisors (293122909).

1221345325 is an equidigital number, since it uses as much as digits as its factorization.

1221345325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48853823 (or 48853818 counting only the distinct ones).

The product of its digits is 7200, while the sum is 28.

The square root of 1221345325 is about 34947.7513582777. The cubic root of 1221345325 is about 1068.9223508282.

Adding to 1221345325 its reverse (5235431221), we get a palindrome (6456776546).

The spelling of 1221345325 in words is "one billion, two hundred twenty-one million, three hundred forty-five thousand, three hundred twenty-five".