21963201779 has 2 divisors, whose sum is σ = 21963201780. Its totient is φ = 21963201778.

The previous prime is 21963201761. The next prime is 21963201839. The reversal of 21963201779 is 97710236912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21963201779 - 2¹⁶ = 21963136243 is a prime.

It is not a weakly prime, because it can be changed into another prime (21963201709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10981600889 + 10981600890.

It is an arithmetic number, because the mean of its divisors is an integer number (10981600890).

Almost surely, 2^21963201779 is an apocalyptic number.

21963201779 is a deficient number, since it is larger than the sum of its proper divisors (1).

21963201779 is an equidigital number, since it uses as much as digits as its factorization.

21963201779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 285768, while the sum is 47.

The spelling of 21963201779 in words is "twenty-one billion, nine hundred sixty-three million, two hundred one thousand, seven hundred seventy-nine".