21110049 has 12 divisors (see below), whose sum is σ = 30568356. Its totient is φ = 14038272.

The previous prime is 21110041. The next prime is 21110051. The reversal of 21110049 is 94001112.

It can be written as a sum of positive squares in 2 ways, for example, as 2030625 + 19079424 = 1425^2 + 4368^2 .

It is not a de Polignac number, because 21110049 - 2³ = 21110041 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21110041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1189 + ... + 6605.

It is an arithmetic number, because the mean of its divisors is an integer number (2547363).

Almost surely, 2^21110049 is an apocalyptic number.

It is an amenable number.

21110049 is a deficient number, since it is larger than the sum of its proper divisors (9458307).

21110049 is a wasteful number, since it uses less digits than its factorization.

21110049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5856 (or 5853 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 21110049 is about 4594.5673354517. The cubic root of 21110049 is about 276.3735097406.

The spelling of 21110049 in words is "twenty-one million, one hundred ten thousand, forty-nine".