21323044001 has 16 divisors (see below), whose sum is σ = 24502558080. Its totient is φ = 18177073920.

The previous prime is 21323043997. The next prime is 21323044021. The reversal of 21323044001 is 10044032312.

It is a cyclic number.

It is not a de Polignac number, because 21323044001 - 2² = 21323043997 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21323044021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1336610 + ... + 1352468.

It is an arithmetic number, because the mean of its divisors is an integer number (1531409880).

Almost surely, 2^21323044001 is an apocalyptic number.

It is an amenable number.

21323044001 is a deficient number, since it is larger than the sum of its proper divisors (3179514079).

21323044001 is a wasteful number, since it uses less digits than its factorization.

21323044001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16904.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21323044001 its reverse (10044032312), we get a palindrome (31367076313).

The spelling of 21323044001 in words is "twenty-one billion, three hundred twenty-three million, forty-four thousand, one".