12434243400021 has 32 divisors (see below), whose sum is σ = 17932260021760. Its totient is φ = 7637109489216.

The previous prime is 12434243399989. The next prime is 12434243400071. The reversal of 12434243400021 is 12000434243421.

It is not a de Polignac number, because 12434243400021 - 2⁵ = 12434243399989 is a prime.

It is a super-2 number, since 2×12434243400021² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12434243400071) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2706990 + ... + 5674176.

It is an arithmetic number, because the mean of its divisors is an integer number (560383125680).

Almost surely, 2^{12434243400021} is an apocalyptic number.

It is an amenable number.

12434243400021 is a deficient number, since it is larger than the sum of its proper divisors (5498016621739).

12434243400021 is a wasteful number, since it uses less digits than its factorization.

12434243400021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2969233.

The product of its (nonzero) digits is 18432, while the sum is 30.

Adding to 12434243400021 its reverse (12000434243421), we get a palindrome (24434677643442).

The spelling of 12434243400021 in words is "twelve trillion, four hundred thirty-four billion, two hundred forty-three million, four hundred thousand, twenty-one".