21423434212725 has 24 divisors (see below), whose sum is σ = 35420356931232. Its totient is φ = 11425741569600.

The previous prime is 21423434212717. The next prime is 21423434212777. The reversal of 21423434212725 is 52721243432412.

It is not a de Polignac number, because 21423434212725 - 2³ = 21423434212717 is a prime.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 9070615 + ... + 11185835.

It is an arithmetic number, because the mean of its divisors is an integer number (1475848205468).

Almost surely, 2^{21423434212725} is an apocalyptic number.

21423434212725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21423434212725 is a deficient number, since it is larger than the sum of its proper divisors (13996922718507).

21423434212725 is a wasteful number, since it uses less digits than its factorization.

21423434212725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2250277 (or 2250272 counting only the distinct ones).

The product of its digits is 645120, while the sum is 42.

The spelling of 21423434212725 in words is "twenty-one trillion, four hundred twenty-three billion, four hundred thirty-four million, two hundred twelve thousand, seven hundred twenty-five".