21761711149 has 2 divisors, whose sum is σ = 21761711150. Its totient is φ = 21761711148.

The previous prime is 21761711131. The next prime is 21761711189. The reversal of 21761711149 is 94111716712.

It is an a-pointer prime, because the next prime (21761711189) can be obtained adding 21761711149 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13538486025 + 8223225124 = 116355^2 + 90682^2 .

It is a cyclic number.

It is not a de Polignac number, because 21761711149 - 2⁵ = 21761711117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21761711129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10880855574 + 10880855575.

It is an arithmetic number, because the mean of its divisors is an integer number (10880855575).

Almost surely, 2^21761711149 is an apocalyptic number.

It is an amenable number.

21761711149 is a deficient number, since it is larger than the sum of its proper divisors (1).

21761711149 is an equidigital number, since it uses as much as digits as its factorization.

21761711149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 40.

The spelling of 21761711149 in words is "twenty-one billion, seven hundred sixty-one million, seven hundred eleven thousand, one hundred forty-nine".