21321011113 has 4 divisors (see below), whose sum is σ = 21337176960. Its totient is φ = 21304845268.

The previous prime is 21321011053. The next prime is 21321011119. The reversal of 21321011113 is 31111012312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21321011113 - 2¹⁷ = 21320880041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21321011119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8080945 + ... + 8083582.

It is an arithmetic number, because the mean of its divisors is an integer number (5334294240).

Almost surely, 2^21321011113 is an apocalyptic number.

It is an amenable number.

21321011113 is a deficient number, since it is larger than the sum of its proper divisors (16165847).

21321011113 is a wasteful number, since it uses less digits than its factorization.

21321011113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16165846.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21321011113 its reverse (31111012312), we get a palindrome (52432023425).

The spelling of 21321011113 in words is "twenty-one billion, three hundred twenty-one million, eleven thousand, one hundred thirteen".