21020244143411 has 16 divisors (see below), whose sum is σ = 21297799545984. Its totient is φ = 20744507288064.

The previous prime is 21020244143323. The next prime is 21020244143441. The reversal of 21020244143411 is 11434144202012.

It is a cyclic number.

It is not a de Polignac number, because 21020244143411 - 2¹⁸ = 21020243881267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020244143441) 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, 372717431 + ... + 372773823.

It is an arithmetic number, because the mean of its divisors is an integer number (1331112471624).

Almost surely, 2^{21020244143411} is an apocalyptic number.

21020244143411 is a deficient number, since it is larger than the sum of its proper divisors (277555402573).

21020244143411 is a wasteful number, since it uses less digits than its factorization.

21020244143411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72430.

The product of its (nonzero) digits is 6144, while the sum is 29.

Adding to 21020244143411 its reverse (11434144202012), we get a palindrome (32454388345423).

The spelling of 21020244143411 in words is "twenty-one trillion, twenty billion, two hundred forty-four million, one hundred forty-three thousand, four hundred eleven".