21444014121211 has 16 divisors (see below), whose sum is σ = 24625109059200. Its totient is φ = 18468226022400.

The previous prime is 21444014121193. The next prime is 21444014121259. The reversal of 21444014121211 is 11212141044412.

It is a happy number.

It is not a de Polignac number, because 21444014121211 - 2²⁷ = 21443879903483 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21444014121211.

It is not an unprimeable number, because it can be changed into a prime (21444014181211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12432780 + ... + 14052118.

It is an arithmetic number, because the mean of its divisors is an integer number (1539069316200).

Almost surely, 2^{21444014121211} is an apocalyptic number.

21444014121211 is a deficient number, since it is larger than the sum of its proper divisors (3181094937989).

21444014121211 is a wasteful number, since it uses less digits than its factorization.

21444014121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1682730.

The product of its (nonzero) digits is 2048, while the sum is 28.

Adding to 21444014121211 its reverse (11212141044412), we get a palindrome (32656155165623).

The spelling of 21444014121211 in words is "twenty-one trillion, four hundred forty-four billion, fourteen million, one hundred twenty-one thousand, two hundred eleven".