21386889113 has 4 divisors (see below), whose sum is σ = 21392110800. Its totient is φ = 21381667428.

The previous prime is 21386889107. The next prime is 21386889127. The reversal of 21386889113 is 31198868312.

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 21386889113 - 2⁸ = 21386888857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21386889143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2604695 + ... + 2612892.

It is an arithmetic number, because the mean of its divisors is an integer number (5348027700).

Almost surely, 2^21386889113 is an apocalyptic number.

It is an amenable number.

21386889113 is a deficient number, since it is larger than the sum of its proper divisors (5221687).

21386889113 is an equidigital number, since it uses as much as digits as its factorization.

21386889113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5221686.

The product of its digits is 497664, while the sum is 50.

The spelling of 21386889113 in words is "twenty-one billion, three hundred eighty-six million, eight hundred eighty-nine thousand, one hundred thirteen".