21455521450434 has 24 divisors (see below), whose sum is σ = 46497062597232. Its totient is φ = 7150286721240.

The previous prime is 21455521450369. The next prime is 21455521450439. The reversal of 21455521450434 is 43405412555412.

21455521450434 is a `hidden beast` number, since 2 + 1 + 4 + 5 + 552 + 1 + 4 + 50 + 43 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 21455521450434.

It is not an unprimeable number, because it can be changed into a prime (21455521450439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 129395032 + ... + 129560739.

It is an arithmetic number, because the mean of its divisors is an integer number (1937377608218).

Almost surely, 2^{21455521450434} is an apocalyptic number.

21455521450434 is an abundant number, since it is smaller than the sum of its proper divisors (25041541146798).

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

21455521450434 is a wasteful number, since it uses less digits than its factorization.

21455521450434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258960382 (or 258960379 counting only the distinct ones).

The product of its (nonzero) digits is 1920000, while the sum is 45.

The spelling of 21455521450434 in words is "twenty-one trillion, four hundred fifty-five billion, five hundred twenty-one million, four hundred fifty thousand, four hundred thirty-four".