21342044021 has 8 divisors (see below), whose sum is σ = 21996099840. Its totient is φ = 20696320368.

The previous prime is 21342043997. The next prime is 21342044029. The reversal of 21342044021 is 12044024312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21342044021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342044029) 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, 2077841 + ... + 2088086.

It is an arithmetic number, because the mean of its divisors is an integer number (2749512480).

Almost surely, 2^21342044021 is an apocalyptic number.

It is an amenable number.

21342044021 is a deficient number, since it is larger than the sum of its proper divisors (654055819).

21342044021 is a wasteful number, since it uses less digits than its factorization.

21342044021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4166083.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21342044021 its reverse (12044024312), we get a palindrome (33386068333).

The spelling of 21342044021 in words is "twenty-one billion, three hundred forty-two million, forty-four thousand, twenty-one".