21376143779 has 2 divisors, whose sum is σ = 21376143780. Its totient is φ = 21376143778.

The previous prime is 21376143769. The next prime is 21376143869. The reversal of 21376143779 is 97734167312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21376143779 is a prime.

It is not a weakly prime, because it can be changed into another prime (21376143769) 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 as a sum of consecutive naturals, namely, 10688071889 + 10688071890.

It is an arithmetic number, because the mean of its divisors is an integer number (10688071890).

Almost surely, 2^21376143779 is an apocalyptic number.

21376143779 is a deficient number, since it is larger than the sum of its proper divisors (1).

21376143779 is an equidigital number, since it uses as much as digits as its factorization.

21376143779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1333584, while the sum is 50.

The spelling of 21376143779 in words is "twenty-one billion, three hundred seventy-six million, one hundred forty-three thousand, seven hundred seventy-nine".