21110769 has 6 divisors (see below), whose sum is σ = 30493346. Its totient is φ = 14073840.

The previous prime is 21110737. The next prime is 21110813. The reversal of 21110769 is 96701112.

It can be written as a sum of positive squares in only one way, i.e., 17640000 + 3470769 = 4200^2 + 1863^2 .

It is not a de Polignac number, because 21110769 - 2⁵ = 21110737 is a prime.

It is a super-2 number, since 2×21110769² = 891329135542722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21110669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1172812 + ... + 1172829.

Almost surely, 2^21110769 is an apocalyptic number.

It is an amenable number.

21110769 is a deficient number, since it is larger than the sum of its proper divisors (9382577).

21110769 is a wasteful number, since it uses less digits than its factorization.

21110769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2345647 (or 2345644 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 27.

The square root of 21110769 is about 4594.6456881897. The cubic root of 21110769 is about 276.3766517934.

The spelling of 21110769 in words is "twenty-one million, one hundred ten thousand, seven hundred sixty-nine".