1005252145421 has 4 divisors (see below), whose sum is σ = 1008484467744. Its totient is φ = 1002019823100.

The previous prime is 1005252145361. The next prime is 1005252145501. The reversal of 1005252145421 is 1245412525001.

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-1005252145421 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 (1005252145721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1616160695 + ... + 1616161316.

It is an arithmetic number, because the mean of its divisors is an integer number (252121116936).

Almost surely, 2^{1005252145421} is an apocalyptic number.

It is an amenable number.

1005252145421 is a deficient number, since it is larger than the sum of its proper divisors (3232322323).

1005252145421 is an equidigital number, since it uses as much as digits as its factorization.

1005252145421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3232322322.

The product of its (nonzero) digits is 16000, while the sum is 32.

The spelling of 1005252145421 in words is "one trillion, five billion, two hundred fifty-two million, one hundred forty-five thousand, four hundred twenty-one".