21141787 has 2 divisors, whose sum is σ = 21141788. Its totient is φ = 21141786.

The previous prime is 21141779. The next prime is 21141793. The reversal of 21141787 is 78714112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21141787 - 2³ = 21141779 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21141707) 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, 10570893 + 10570894.

It is an arithmetic number, because the mean of its divisors is an integer number (10570894).

Almost surely, 2^21141787 is an apocalyptic number.

21141787 is a deficient number, since it is larger than the sum of its proper divisors (1).

21141787 is an equidigital number, since it uses as much as digits as its factorization.

21141787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3136, while the sum is 31.

The square root of 21141787 is about 4598.0198999134. The cubic root of 21141787 is about 276.5119453935.

Adding to 21141787 its reverse (78714112), we get a palindrome (99855899).

The spelling of 21141787 in words is "twenty-one million, one hundred forty-one thousand, seven hundred eighty-seven".