21111344885 has 8 divisors (see below), whose sum is σ = 26666962080. Its totient is φ = 16000177104.

The previous prime is 21111344873. The next prime is 21111344909. The reversal of 21111344885 is 58844311112.

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 21111344885 - 2⁴ = 21111344869 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111112247 + ... + 111112436.

It is an arithmetic number, because the mean of its divisors is an integer number (3333370260).

Almost surely, 2^21111344885 is an apocalyptic number.

It is an amenable number.

21111344885 is a deficient number, since it is larger than the sum of its proper divisors (5555617195).

21111344885 is a wasteful number, since it uses less digits than its factorization.

21111344885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222224707.

The product of its digits is 30720, while the sum is 38.

Adding to 21111344885 its reverse (58844311112), we get a palindrome (79955655997).

The spelling of 21111344885 in words is "twenty-one billion, one hundred eleven million, three hundred forty-four thousand, eight hundred eighty-five".