1225242230521 has 4 divisors (see below), whose sum is σ = 1278513631872. Its totient is φ = 1171970829172.

The previous prime is 1225242230501. The next prime is 1225242230543. The reversal of 1225242230521 is 1250322425221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1225242230521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1225242230501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26635700641 + ... + 26635700686.

It is an arithmetic number, because the mean of its divisors is an integer number (319628407968).

Almost surely, 2^{1225242230521} is an apocalyptic number.

It is an amenable number.

1225242230521 is a deficient number, since it is larger than the sum of its proper divisors (53271401351).

1225242230521 is an equidigital number, since it uses as much as digits as its factorization.

1225242230521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53271401350.

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 1225242230521 its reverse (1250322425221), we get a palindrome (2475564655742).

The spelling of 1225242230521 in words is "one trillion, two hundred twenty-five billion, two hundred forty-two million, two hundred thirty thousand, five hundred twenty-one".