1245421551305 has 4 divisors (see below), whose sum is σ = 1494505861572. Its totient is φ = 996337241040.

The previous prime is 1245421551287. The next prime is 1245421551317. The reversal of 1245421551305 is 5031551245421.

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 201123547024 + 1044298004281 = 448468^2 + 1021909^2 .

It is not a de Polignac number, because 1245421551305 - 2²² = 1245417357001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124542155126 + ... + 124542155135.

It is an arithmetic number, because the mean of its divisors is an integer number (373626465393).

Almost surely, 2^{1245421551305} is an apocalyptic number.

It is an amenable number.

1245421551305 is a deficient number, since it is larger than the sum of its proper divisors (249084310267).

1245421551305 is an equidigital number, since it uses as much as digits as its factorization.

1245421551305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249084310266.

The product of its (nonzero) digits is 120000, while the sum is 38.

Adding to 1245421551305 its reverse (5031551245421), we get a palindrome (6276972796726).

The spelling of 1245421551305 in words is "one trillion, two hundred forty-five billion, four hundred twenty-one million, five hundred fifty-one thousand, three hundred five".