21380441767 has 2 divisors, whose sum is σ = 21380441768. Its totient is φ = 21380441766.

The previous prime is 21380441723. The next prime is 21380441773. The reversal of 21380441767 is 76714408312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21380441767 - 2¹⁹ = 21379917479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21380441267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10690220883 + 10690220884.

It is an arithmetic number, because the mean of its divisors is an integer number (10690220884).

Almost surely, 2^21380441767 is an apocalyptic number.

21380441767 is a deficient number, since it is larger than the sum of its proper divisors (1).

21380441767 is an equidigital number, since it uses as much as digits as its factorization.

21380441767 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225792, while the sum is 43.

The spelling of 21380441767 in words is "twenty-one billion, three hundred eighty million, four hundred forty-one thousand, seven hundred sixty-seven".