21324001111 has 16 divisors (see below), whose sum is σ = 24860652544. Its totient is φ = 17913602304.

The previous prime is 21324000961. The next prime is 21324001117. The reversal of 21324001111 is 11110042312.

It is a cyclic number.

It is not a de Polignac number, because 21324001111 - 2²¹ = 21321903959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21324001117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82515 + ... + 222388.

It is an arithmetic number, because the mean of its divisors is an integer number (1553790784).

Almost surely, 2^21324001111 is an apocalyptic number.

21324001111 is a deficient number, since it is larger than the sum of its proper divisors (3536651433).

21324001111 is a wasteful number, since it uses less digits than its factorization.

21324001111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305110.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21324001111 its reverse (11110042312), we get a palindrome (32434043423).

The spelling of 21324001111 in words is "twenty-one billion, three hundred twenty-four million, one thousand, one hundred eleven".