21065044411 has 8 divisors (see below), whose sum is σ = 21630344400. Its totient is φ = 20502197760.

The previous prime is 21065044367. The next prime is 21065044423. The reversal of 21065044411 is 11444056012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21065044411 - 2²⁹ = 20528173499 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 21065044411.

It is not an unprimeable number, because it can be changed into a prime (21065044111) 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 7 ways as a sum of consecutive naturals, for example, 595926 + ... + 630283.

It is an arithmetic number, because the mean of its divisors is an integer number (2703793050).

Almost surely, 2^21065044411 is an apocalyptic number.

21065044411 is a deficient number, since it is larger than the sum of its proper divisors (565299989).

21065044411 is a wasteful number, since it uses less digits than its factorization.

21065044411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1226669.

The product of its (nonzero) digits is 3840, while the sum is 28.

The spelling of 21065044411 in words is "twenty-one billion, sixty-five million, forty-four thousand, four hundred eleven".