21014047 has 2 divisors, whose sum is σ = 21014048. Its totient is φ = 21014046.

The previous prime is 21014041. The next prime is 21014069. The reversal of 21014047 is 74041012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21014047 - 2¹⁹ = 20489759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21014041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10507023 + 10507024.

It is an arithmetic number, because the mean of its divisors is an integer number (10507024).

Almost surely, 2^21014047 is an apocalyptic number.

21014047 is a deficient number, since it is larger than the sum of its proper divisors (1).

21014047 is an equidigital number, since it uses as much as digits as its factorization.

21014047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 21014047 is about 4584.1080920938. The cubic root of 21014047 is about 275.9539191779.

Adding to 21014047 its reverse (74041012), we get a palindrome (95055059).

It can be divided in two parts, 2 and 1014047, that added together give a square (1014049 = 1007²).

The spelling of 21014047 in words is "twenty-one million, fourteen thousand, forty-seven".