21043142142211 has 4 divisors (see below), whose sum is σ = 24049305305392. Its totient is φ = 18036978979032.

The previous prime is 21043142142163. The next prime is 21043142142229. The reversal of 21043142142211 is 11224124134012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21043142142211 - 2⁴³ = 12247049120003 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 21043142142211.

It is not an unprimeable number, because it can be changed into a prime (21043142112211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1503081581580 + ... + 1503081581593.

It is an arithmetic number, because the mean of its divisors is an integer number (6012326326348).

Almost surely, 2^{21043142142211} is an apocalyptic number.

21043142142211 is a deficient number, since it is larger than the sum of its proper divisors (3006163163181).

21043142142211 is an equidigital number, since it uses as much as digits as its factorization.

21043142142211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3006163163180.

The product of its (nonzero) digits is 3072, while the sum is 28.

Adding to 21043142142211 its reverse (11224124134012), we get a palindrome (32267266276223).

The spelling of 21043142142211 in words is "twenty-one trillion, forty-three billion, one hundred forty-two million, one hundred forty-two thousand, two hundred eleven".