1247842487421 has 16 divisors (see below), whose sum is σ = 1898619201600. Its totient is φ = 809411342544.

The previous prime is 1247842487399. The next prime is 1247842487449.

1247842487421 is a `hidden beast` number, since 1 + 2 + 47 + 84 + 2 + 487 + 42 + 1 = 666.

1247842487421 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1247842487421 - 2⁵ = 1247842487389 is a prime.

It is a super-2 number, since 2×1247842487421² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247842487321) 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 15 ways as a sum of consecutive naturals, for example, 624544791 + ... + 624546788.

It is an arithmetic number, because the mean of its divisors is an integer number (118663700100).

Almost surely, 2^{1247842487421} is an apocalyptic number.

It is an amenable number.

1247842487421 is a deficient number, since it is larger than the sum of its proper divisors (650776714179).

1247842487421 is a wasteful number, since it uses less digits than its factorization.

1247842487421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249091625 (or 1249091619 counting only the distinct ones).

The product of its digits is 6422528, while the sum is 54.

The spelling of 1247842487421 in words is "one trillion, two hundred forty-seven billion, eight hundred forty-two million, four hundred eighty-seven thousand, four hundred twenty-one".