21324004454 has 4 divisors (see below), whose sum is σ = 31986006684. Its totient is φ = 10662002226.

The previous prime is 21324004433. The next prime is 21324004477. The reversal of 21324004454 is 45440042312.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5331001112 + ... + 5331001115.

It is an arithmetic number, because the mean of its divisors is an integer number (7996501671).

Almost surely, 2^21324004454 is an apocalyptic number.

21324004454 is a deficient number, since it is larger than the sum of its proper divisors (10662002230).

21324004454 is a wasteful number, since it uses less digits than its factorization.

21324004454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10662002229.

The product of its (nonzero) digits is 15360, while the sum is 29.

Adding to 21324004454 its reverse (45440042312), we get a palindrome (66764046766).

The spelling of 21324004454 in words is "twenty-one billion, three hundred twenty-four million, four thousand, four hundred fifty-four".