21014305 has 16 divisors (see below), whose sum is σ = 27331920. Its totient is φ = 15510144.

The previous prime is 21014303. The next prime is 21014327. The reversal of 21014305 is 50341012.

It can be written as a sum of positive squares in 8 ways, for example, as 11669056 + 9345249 = 3416^2 + 3057^2 .

It is not a de Polignac number, because 21014305 - 2¹ = 21014303 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (21014303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10029 + ... + 11941.

It is an arithmetic number, because the mean of its divisors is an integer number (1708245).

Almost surely, 2^21014305 is an apocalyptic number.

It is an amenable number.

21014305 is a deficient number, since it is larger than the sum of its proper divisors (6317615).

21014305 is an equidigital number, since it uses as much as digits as its factorization.

21014305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1957 (or 1931 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 21014305 is about 4584.1362327051. The cubic root of 21014305 is about 275.9550485149.

Adding to 21014305 its reverse (50341012), we get a palindrome (71355317).

The spelling of 21014305 in words is "twenty-one million, fourteen thousand, three hundred five".