21093114421 has 4 divisors (see below), whose sum is σ = 21438903244. Its totient is φ = 20747325600.

The previous prime is 21093114389. The next prime is 21093114433. The reversal of 21093114421 is 12441139012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4858787025 + 16234327396 = 69705^2 + 127414^2 .

It is a cyclic number.

It is not a de Polignac number, because 21093114421 - 2⁵ = 21093114389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21093114421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21093184421) 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 3 ways as a sum of consecutive naturals, for example, 172894320 + ... + 172894441.

It is an arithmetic number, because the mean of its divisors is an integer number (5359725811).

Almost surely, 2^21093114421 is an apocalyptic number.

It is an amenable number.

21093114421 is a deficient number, since it is larger than the sum of its proper divisors (345788823).

21093114421 is an equidigital number, since it uses as much as digits as its factorization.

21093114421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345788822.

The product of its (nonzero) digits is 1728, while the sum is 28.

The spelling of 21093114421 in words is "twenty-one billion, ninety-three million, one hundred fourteen thousand, four hundred twenty-one".