21424012433225 has 12 divisors (see below), whose sum is σ = 26565854148240. Its totient is φ = 17139159152400.

The previous prime is 21424012433207. The next prime is 21424012433227. The reversal of 21424012433225 is 52233421042412.

It is not a de Polignac number, because 21424012433225 - 2²² = 21424008238921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21424012433227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8945930 + ... + 11085020.

It is an arithmetic number, because the mean of its divisors is an integer number (2213821179020).

Almost surely, 2^{21424012433225} is an apocalyptic number.

21424012433225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21424012433225 is a deficient number, since it is larger than the sum of its proper divisors (5141841715015).

21424012433225 is a wasteful number, since it uses less digits than its factorization.

21424012433225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2539720 (or 2539715 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 35.

Adding to 21424012433225 its reverse (52233421042412), we get a palindrome (73657433475637).

The spelling of 21424012433225 in words is "twenty-one trillion, four hundred twenty-four billion, twelve million, four hundred thirty-three thousand, two hundred twenty-five".