21013244444001 has 16 divisors (see below), whose sum is σ = 28045393908480. Its totient is φ = 13994963047680.

The previous prime is 21013244443987. The next prime is 21013244444009. The reversal of 21013244444001 is 10044444231012.

It is a happy number.

It is not a de Polignac number, because 21013244444001 - 2⁹ = 21013244443489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21013244444001.

It is not an unprimeable number, because it can be changed into a prime (21013244444009) 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 15 ways as a sum of consecutive naturals, for example, 155885491 + ... + 156020231.

It is an arithmetic number, because the mean of its divisors is an integer number (1752837119280).

Almost surely, 2^{21013244444001} is an apocalyptic number.

It is an amenable number.

21013244444001 is a deficient number, since it is larger than the sum of its proper divisors (7032149464479).

21013244444001 is a wasteful number, since it uses less digits than its factorization.

21013244444001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185816.

The product of its (nonzero) digits is 12288, while the sum is 30.

Adding to 21013244444001 its reverse (10044444231012), we get a palindrome (31057688675013).

The spelling of 21013244444001 in words is "twenty-one trillion, thirteen billion, two hundred forty-four million, four hundred forty-four thousand, one".