21014887 has 2 divisors, whose sum is σ = 21014888. Its totient is φ = 21014886.

The previous prime is 21014867. The next prime is 21014899. The reversal of 21014887 is 78841012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21014887 - 2¹⁹ = 20490599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21014857) 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, 10507443 + 10507444.

It is an arithmetic number, because the mean of its divisors is an integer number (10507444).

Almost surely, 2^21014887 is an apocalyptic number.

21014887 is a deficient number, since it is larger than the sum of its proper divisors (1).

21014887 is an equidigital number, since it uses as much as digits as its factorization.

21014887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 21014887 is about 4584.1997120544. The cubic root of 21014887 is about 275.9575960550.

Adding to 21014887 its reverse (78841012), we get a palindrome (99855899).

The spelling of 21014887 in words is "twenty-one million, fourteen thousand, eight hundred eighty-seven".