21344133021 has 8 divisors (see below), whose sum is σ = 28819082880. Its totient is φ = 14049302592.

The previous prime is 21344133017. The next prime is 21344133061. The reversal of 21344133021 is 12033144312.

It is a happy number.

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

It is not a de Polignac number, because 21344133021 - 2² = 21344133017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21344132982 and 21344133000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344133001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45029580 + ... + 45030053.

It is an arithmetic number, because the mean of its divisors is an integer number (3602385360).

Almost surely, 2^21344133021 is an apocalyptic number.

It is an amenable number.

21344133021 is a deficient number, since it is larger than the sum of its proper divisors (7474949859).

21344133021 is an equidigital number, since it uses as much as digits as its factorization.

21344133021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90059715.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21344133021 its reverse (12033144312), we get a palindrome (33377277333).

The spelling of 21344133021 in words is "twenty-one billion, three hundred forty-four million, one hundred thirty-three thousand, twenty-one".