21459385540425 has 48 divisors (see below), whose sum is σ = 40675931966592. Its totient is φ = 9779058355200.

The previous prime is 21459385540423. The next prime is 21459385540451. The reversal of 21459385540425 is 52404558395412.

It is not a de Polignac number, because 21459385540425 - 2¹ = 21459385540423 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21459385540423) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 64305216 + ... + 64638065.

It is an arithmetic number, because the mean of its divisors is an integer number (847415249304).

Almost surely, 2^{21459385540425} is an apocalyptic number.

21459385540425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21459385540425 is a deficient number, since it is larger than the sum of its proper divisors (19216546426167).

21459385540425 is a wasteful number, since it uses less digits than its factorization.

21459385540425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128943618 (or 128943613 counting only the distinct ones).

The product of its (nonzero) digits is 34560000, while the sum is 57.

The spelling of 21459385540425 in words is "twenty-one trillion, four hundred fifty-nine billion, three hundred eighty-five million, five hundred forty thousand, four hundred twenty-five".