21332443001 has 4 divisors (see below), whose sum is σ = 21420959604. Its totient is φ = 21243926400.

The previous prime is 21332442997. The next prime is 21332443003. The reversal of 21332443001 is 10034423312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9385734400 + 11946708601 = 96880^2 + 109301^2 .

It is a cyclic number.

It is not a de Polignac number, because 21332443001 - 2² = 21332442997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21332443003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44257940 + ... + 44258421.

It is an arithmetic number, because the mean of its divisors is an integer number (5355239901).

Almost surely, 2^21332443001 is an apocalyptic number.

It is an amenable number.

21332443001 is a deficient number, since it is larger than the sum of its proper divisors (88516603).

21332443001 is an equidigital number, since it uses as much as digits as its factorization.

21332443001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88516602.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21332443001 its reverse (10034423312), we get a palindrome (31366866313).

The spelling of 21332443001 in words is "twenty-one billion, three hundred thirty-two million, four hundred forty-three thousand, one".