21380441773 has 2 divisors, whose sum is σ = 21380441774. Its totient is φ = 21380441772.

The previous prime is 21380441767. The next prime is 21380441779. The reversal of 21380441773 is 37714408312.

It is a balanced prime because it is at equal distance from previous prime (21380441767) and next prime (21380441779).

It can be written as a sum of positive squares in only one way, i.e., 11634211044 + 9746230729 = 107862^2 + 98723^2 .

It is a cyclic number.

It is not a de Polignac number, because 21380441773 - 2¹⁷ = 21380310701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21380441779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10690220886 + 10690220887.

It is an arithmetic number, because the mean of its divisors is an integer number (10690220887).

Almost surely, 2^21380441773 is an apocalyptic number.

It is an amenable number.

21380441773 is a deficient number, since it is larger than the sum of its proper divisors (1).

21380441773 is an equidigital number, since it uses as much as digits as its factorization.

21380441773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 40.

The spelling of 21380441773 in words is "twenty-one billion, three hundred eighty million, four hundred forty-one thousand, seven hundred seventy-three".