21120044311 has 8 divisors (see below), whose sum is σ = 21398420160. Its totient is φ = 20843273472.

The previous prime is 21120044287. The next prime is 21120044329. The reversal of 21120044311 is 11344002112.

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 21120044311 - 2⁹ = 21120043799 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 (21120044371) 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, 374751 + ... + 427408.

It is an arithmetic number, because the mean of its divisors is an integer number (2674802520).

Almost surely, 2^21120044311 is an apocalyptic number.

21120044311 is a deficient number, since it is larger than the sum of its proper divisors (278375849).

21120044311 is a wasteful number, since it uses less digits than its factorization.

21120044311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802505.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21120044311 its reverse (11344002112), we get a palindrome (32464046423).

The spelling of 21120044311 in words is "twenty-one billion, one hundred twenty million, forty-four thousand, three hundred eleven".