21455522212434 has 16 divisors (see below), whose sum is σ = 42911629313088. Its totient is φ = 7151743256112.

The previous prime is 21455522212433. The next prime is 21455522212451. The reversal of 21455522212434 is 43421222555412.

It is not an unprimeable number, because it can be changed into a prime (21455522212433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23892742 + ... + 24774465.

It is an arithmetic number, because the mean of its divisors is an integer number (2681976832068).

Almost surely, 2^{21455522212434} is an apocalyptic number.

21455522212434 is an abundant number, since it is smaller than the sum of its proper divisors (21456107100654).

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

21455522212434 is a wasteful number, since it uses less digits than its factorization.

21455522212434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48740689.

The product of its digits is 768000, while the sum is 42.

Adding to 21455522212434 its reverse (43421222555412), we get a palindrome (64876744767846).

The spelling of 21455522212434 in words is "twenty-one trillion, four hundred fifty-five billion, five hundred twenty-two million, two hundred twelve thousand, four hundred thirty-four".