21143121411 has 16 divisors (see below), whose sum is σ = 28281859328. Its totient is φ = 14049957600.

The previous prime is 21143121403. The next prime is 21143121431. The reversal of 21143121411 is 11412134112.

It is not a de Polignac number, because 21143121411 - 2³ = 21143121403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21143121401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1624050 + ... + 1637016.

It is an arithmetic number, because the mean of its divisors is an integer number (1767616208).

Almost surely, 2^21143121411 is an apocalyptic number.

21143121411 is a deficient number, since it is larger than the sum of its proper divisors (7138737917).

21143121411 is a wasteful number, since it uses less digits than its factorization.

21143121411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14682.

The product of its digits is 192, while the sum is 21.

Adding to 21143121411 its reverse (11412134112), we get a palindrome (32555255523).

The spelling of 21143121411 in words is "twenty-one billion, one hundred forty-three million, one hundred twenty-one thousand, four hundred eleven".