21763198819 has 2 divisors, whose sum is σ = 21763198820. Its totient is φ = 21763198818.

The previous prime is 21763198777. The next prime is 21763198837. The reversal of 21763198819 is 91889136712.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21763198819 - 2⁹ = 21763198307 is a prime.

It is a super-2 number, since 2×21763198819² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21763198819.

It is not a weakly prime, because it can be changed into another prime (21763198019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10881599409 + 10881599410.

It is an arithmetic number, because the mean of its divisors is an integer number (10881599410).

Almost surely, 2^21763198819 is an apocalyptic number.

21763198819 is a deficient number, since it is larger than the sum of its proper divisors (1).

21763198819 is an equidigital number, since it uses as much as digits as its factorization.

21763198819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 55.

The spelling of 21763198819 in words is "twenty-one billion, seven hundred sixty-three million, one hundred ninety-eight thousand, eight hundred nineteen".