21144043104311 has 4 divisors (see below), whose sum is σ = 21144054558000. Its totient is φ = 21144031650624.

The previous prime is 21144043104281. The next prime is 21144043104397. The reversal of 21144043104311 is 11340134044112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21144043104311 - 2³⁸ = 20869165197367 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 (21144043104211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2256986 + ... + 6883463.

It is an arithmetic number, because the mean of its divisors is an integer number (5286013639500).

Almost surely, 2^{21144043104311} is an apocalyptic number.

21144043104311 is a deficient number, since it is larger than the sum of its proper divisors (11453689).

21144043104311 is an equidigital number, since it uses as much as digits as its factorization.

21144043104311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11453688.

The product of its (nonzero) digits is 4608, while the sum is 29.

Adding to 21144043104311 its reverse (11340134044112), we get a palindrome (32484177148423).

The spelling of 21144043104311 in words is "twenty-one trillion, one hundred forty-four billion, forty-three million, one hundred four thousand, three hundred eleven".