21344231215501 has 8 divisors (see below), whose sum is σ = 21432127500000. Its totient is φ = 21256357626000.

The previous prime is 21344231215451. The next prime is 21344231215511. The reversal of 21344231215501 is 10551213244312.

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 21344231215501 - 2¹¹ = 21344231213453 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 (21344231215511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3787626 + ... + 7552123.

It is an arithmetic number, because the mean of its divisors is an integer number (2679015937500).

Almost surely, 2^{21344231215501} is an apocalyptic number.

It is an amenable number.

21344231215501 is a deficient number, since it is larger than the sum of its proper divisors (87896284499).

21344231215501 is a wasteful number, since it uses less digits than its factorization.

21344231215501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11347499.

The product of its (nonzero) digits is 28800, while the sum is 34.

Adding to 21344231215501 its reverse (10551213244312), we get a palindrome (31895444459813).

The spelling of 21344231215501 in words is "twenty-one trillion, three hundred forty-four billion, two hundred thirty-one million, two hundred fifteen thousand, five hundred one".