21425463959709 has 8 divisors (see below), whose sum is σ = 28568161143072. Its totient is φ = 14283204708080.

The previous prime is 21425463959657. The next prime is 21425463959729. The reversal of 21425463959709 is 90795936452412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21425463959709 - 2⁹ = 21425463959197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21425463959709.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21425463959729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109368759 + ... + 109564484.

It is an arithmetic number, because the mean of its divisors is an integer number (3571020142884).

Almost surely, 2^{21425463959709} is an apocalyptic number.

It is an amenable number.

21425463959709 is a deficient number, since it is larger than the sum of its proper divisors (7142697183363).

21425463959709 is a wasteful number, since it uses less digits than its factorization.

21425463959709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218965867.

The product of its (nonzero) digits is 146966400, while the sum is 66.

The spelling of 21425463959709 in words is "twenty-one trillion, four hundred twenty-five billion, four hundred sixty-three million, nine hundred fifty-nine thousand, seven hundred nine".