21110124769 has 2 divisors, whose sum is σ = 21110124770. Its totient is φ = 21110124768.

The previous prime is 21110124733. The next prime is 21110124823. The reversal of 21110124769 is 96742101112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20567001744 + 543123025 = 143412^2 + 23305^2 .

It is a cyclic number.

It is not a de Polignac number, because 21110124769 - 2⁹ = 21110124257 is a prime.

It is a super-2 number, since 2×21110124769² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21110124869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555062384 + 10555062385.

It is an arithmetic number, because the mean of its divisors is an integer number (10555062385).

Almost surely, 2^21110124769 is an apocalyptic number.

It is an amenable number.

21110124769 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110124769 is an equidigital number, since it uses as much as digits as its factorization.

21110124769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 34.

The spelling of 21110124769 in words is "twenty-one billion, one hundred ten million, one hundred twenty-four thousand, seven hundred sixty-nine".