21380441723 has 2 divisors, whose sum is σ = 21380441724. Its totient is φ = 21380441722.

The previous prime is 21380441597. The next prime is 21380441767. The reversal of 21380441723 is 32714408312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21380441723 - 2¹⁰ = 21380440699 is a prime.

It is not a weakly prime, because it can be changed into another prime (21380441773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10690220861 + 10690220862.

It is an arithmetic number, because the mean of its divisors is an integer number (10690220862).

Almost surely, 2^21380441723 is an apocalyptic number.

21380441723 is a deficient number, since it is larger than the sum of its proper divisors (1).

21380441723 is an equidigital number, since it uses as much as digits as its factorization.

21380441723 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 35.

The spelling of 21380441723 in words is "twenty-one billion, three hundred eighty million, four hundred forty-one thousand, seven hundred twenty-three".