21204542024526 has 256 divisors, whose sum is σ = 52855632691200. Its totient is φ = 5538056832000.

The previous prime is 21204542024447. The next prime is 21204542024551. The reversal of 21204542024526 is 62542024540212.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1188653115 + ... + 1188670953.

It is an arithmetic number, because the mean of its divisors is an integer number (206467315200).

Almost surely, 2^{21204542024526} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21204542024526, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26427816345600).

21204542024526 is an abundant number, since it is smaller than the sum of its proper divisors (31651090666674).

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

21204542024526 is a wasteful number, since it uses less digits than its factorization.

21204542024526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18335.

The product of its (nonzero) digits is 307200, while the sum is 39.

Adding to 21204542024526 its reverse (62542024540212), we get a palindrome (83746566564738).

The spelling of 21204542024526 in words is "twenty-one trillion, two hundred four billion, five hundred forty-two million, twenty-four thousand, five hundred twenty-six".