21015414344021 has 8 divisors (see below), whose sum is σ = 22123965340320. Its totient is φ = 19907111003472.

The previous prime is 21015414344017. The next prime is 21015414344053. The reversal of 21015414344021 is 12044341451012.

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 21015414344021 - 2² = 21015414344017 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 (21015414344621) 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, 61739735 + ... + 62079188.

It is an arithmetic number, because the mean of its divisors is an integer number (2765495667540).

Almost surely, 2^{21015414344021} is an apocalyptic number.

It is an amenable number.

21015414344021 is a deficient number, since it is larger than the sum of its proper divisors (1108550996299).

21015414344021 is a wasteful number, since it uses less digits than its factorization.

21015414344021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123827875.

The product of its (nonzero) digits is 15360, while the sum is 32.

Adding to 21015414344021 its reverse (12044341451012), we get a palindrome (33059755795033).

The spelling of 21015414344021 in words is "twenty-one trillion, fifteen billion, four hundred fourteen million, three hundred forty-four thousand, twenty-one".