21001432223 has 8 divisors (see below), whose sum is σ = 21228217200. Its totient is φ = 20775863808.

The previous prime is 21001432217. The next prime is 21001432247. The reversal of 21001432223 is 32223410012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21001432223 - 2¹⁴ = 21001415839 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21001432195 and 21001432204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001432253) 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, 269408 + ... + 338501.

It is an arithmetic number, because the mean of its divisors is an integer number (2653527150).

Almost surely, 2^21001432223 is an apocalyptic number.

21001432223 is a deficient number, since it is larger than the sum of its proper divisors (226784977).

21001432223 is a wasteful number, since it uses less digits than its factorization.

21001432223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608281.

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

Adding to 21001432223 its reverse (32223410012), we get a palindrome (53224842235).

The spelling of 21001432223 in words is "twenty-one billion, one million, four hundred thirty-two thousand, two hundred twenty-three".