21404505352026 has 64 divisors (see below), whose sum is σ = 42944554598400. Its totient is φ = 7112294928000.

The previous prime is 21404505352007. The next prime is 21404505352037. The reversal of 21404505352026 is 62025350540412.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9104424751 + ... + 9104427101.

It is an arithmetic number, because the mean of its divisors is an integer number (671008665600).

Almost surely, 2^{21404505352026} is an apocalyptic number.

21404505352026 is an abundant number, since it is smaller than the sum of its proper divisors (21540049246374).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21404505352026 is a wasteful number, since it uses less digits than its factorization.

21404505352026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5955.

The product of its (nonzero) digits is 288000, while the sum is 39.

Adding to 21404505352026 its reverse (62025350540412), we get a palindrome (83429855892438).

The spelling of 21404505352026 in words is "twenty-one trillion, four hundred four billion, five hundred five million, three hundred fifty-two thousand, twenty-six".