21455032013254 has 16 divisors (see below), whose sum is σ = 38943587520288. Its totient is φ = 8654130559872.

The previous prime is 21455032013209. The next prime is 21455032013257. The reversal of 21455032013254 is 45231023055412.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21455032013257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45073596429 + ... + 45073596904.

It is an arithmetic number, because the mean of its divisors is an integer number (2433974220018).

Almost surely, 2^{21455032013254} is an apocalyptic number.

21455032013254 is a deficient number, since it is larger than the sum of its proper divisors (17488555507034).

21455032013254 is a wasteful number, since it uses less digits than its factorization.

21455032013254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90147193359.

The product of its (nonzero) digits is 144000, while the sum is 37.

Adding to 21455032013254 its reverse (45231023055412), we get a palindrome (66686055068666).

The spelling of 21455032013254 in words is "twenty-one trillion, four hundred fifty-five billion, thirty-two million, thirteen thousand, two hundred fifty-four".