1245254224321 has 4 divisors (see below), whose sum is σ = 1245410025412. Its totient is φ = 1245098423232.

The previous prime is 1245254224289. The next prime is 1245254224327. The reversal of 1245254224321 is 1234224525421.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 272861014321 + 972393210000 = 522361^2 + 986100^2 .

It is a cyclic number.

It is not a de Polignac number, because 1245254224321 - 2⁵ = 1245254224289 is a prime.

It is a super-2 number, since 2×1245254224321² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1245254224327) 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, 77888556 + ... + 77904541.

It is an arithmetic number, because the mean of its divisors is an integer number (311352506353).

Almost surely, 2^{1245254224321} is an apocalyptic number.

It is an amenable number.

1245254224321 is a deficient number, since it is larger than the sum of its proper divisors (155801091).

1245254224321 is an equidigital number, since it uses as much as digits as its factorization.

1245254224321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155801090.

The product of its digits is 153600, while the sum is 37.

Adding to 1245254224321 its reverse (1234224525421), we get a palindrome (2479478749742).

The spelling of 1245254224321 in words is "one trillion, two hundred forty-five billion, two hundred fifty-four million, two hundred twenty-four thousand, three hundred twenty-one".