21404540424523 has 8 divisors (see below), whose sum is σ = 21575255108400. Its totient is φ = 21234064672128.

The previous prime is 21404540424503. The next prime is 21404540424541. The reversal of 21404540424523 is 32542404540412.

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 21404540424523 - 2³³ = 21395950489931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21404540424503) 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, 59552986 + ... + 59911327.

It is an arithmetic number, because the mean of its divisors is an integer number (2696906888550).

Almost surely, 2^{21404540424523} is an apocalyptic number.

21404540424523 is a deficient number, since it is larger than the sum of its proper divisors (170714683877).

21404540424523 is a wasteful number, since it uses less digits than its factorization.

21404540424523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119465741.

The product of its (nonzero) digits is 614400, while the sum is 40.

Adding to 21404540424523 its reverse (32542404540412), we get a palindrome (53946944964935).

The spelling of 21404540424523 in words is "twenty-one trillion, four hundred four billion, five hundred forty million, four hundred twenty-four thousand, five hundred twenty-three".