1245241052021 has 4 divisors (see below), whose sum is σ = 1249219458252. Its totient is φ = 1241262645792.

The previous prime is 1245241051991. The next prime is 1245241052039. The reversal of 1245241052021 is 1202501425421.

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 190746195025 + 1054494856996 = 436745^2 + 1026886^2 .

It is a cyclic number.

It is not a de Polignac number, because 1245241052021 - 2³⁴ = 1228061182837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245241052051) 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, 1989202646 + ... + 1989203271.

It is an arithmetic number, because the mean of its divisors is an integer number (312304864563).

Almost surely, 2^{1245241052021} is an apocalyptic number.

It is an amenable number.

1245241052021 is a deficient number, since it is larger than the sum of its proper divisors (3978406231).

1245241052021 is an equidigital number, since it uses as much as digits as its factorization.

1245241052021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3978406230.

The product of its (nonzero) digits is 6400, while the sum is 29.

Adding to 1245241052021 its reverse (1202501425421), we get a palindrome (2447742477442).

The spelling of 1245241052021 in words is "one trillion, two hundred forty-five billion, two hundred forty-one million, fifty-two thousand, twenty-one".