1225012521 has 8 divisors (see below), whose sum is σ = 1653029280. Its totient is φ = 806835392.

The previous prime is 1225012513. The next prime is 1225012531. The reversal of 1225012521 is 1252105221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1225012521 - 2³ = 1225012513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1225012511) 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 7 ways as a sum of consecutive naturals, for example, 2459616 + ... + 2460113.

It is an arithmetic number, because the mean of its divisors is an integer number (206628660).

Almost surely, 2^1225012521 is an apocalyptic number.

It is an amenable number.

1225012521 is a deficient number, since it is larger than the sum of its proper divisors (428016759).

1225012521 is an equidigital number, since it uses as much as digits as its factorization.

1225012521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4919815.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 1225012521 is about 35000.1788709715. The cubic root of 1225012521 is about 1069.9911260801.

Adding to 1225012521 its reverse (1252105221), we get a palindrome (2477117742).

The spelling of 1225012521 in words is "one billion, two hundred twenty-five million, twelve thousand, five hundred twenty-one".