1221404325 has 24 divisors (see below), whose sum is σ = 2022052128. Its totient is φ = 650556480.

The previous prime is 1221404273. The next prime is 1221404329. The reversal of 1221404325 is 5234041221.

It is not a de Polignac number, because 1221404325 - 2¹¹ = 1221402277 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221404295 and 1221404304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221404329) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48679 + ... + 69371.

It is an arithmetic number, because the mean of its divisors is an integer number (84252172).

Almost surely, 2^1221404325 is an apocalyptic number.

1221404325 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1221404325 is a deficient number, since it is larger than the sum of its proper divisors (800647803).

1221404325 is a wasteful number, since it uses less digits than its factorization.

1221404325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21493 (or 21488 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 1221404325 is about 34948.5954653402. The cubic root of 1221404325 is about 1068.9395628325.

Adding to 1221404325 its reverse (5234041221), we get a palindrome (6455445546).

The spelling of 1221404325 in words is "one billion, two hundred twenty-one million, four hundred four thousand, three hundred twenty-five".