21119647 has 2 divisors, whose sum is σ = 21119648. Its totient is φ = 21119646.

The previous prime is 21119641. The next prime is 21119653. The reversal of 21119647 is 74691112.

It is a balanced prime because it is at equal distance from previous prime (21119641) and next prime (21119653).

It is a cyclic number.

It is not a de Polignac number, because 21119647 - 2³ = 21119639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21119641) 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, 10559823 + 10559824.

It is an arithmetic number, because the mean of its divisors is an integer number (10559824).

Almost surely, 2^21119647 is an apocalyptic number.

21119647 is a deficient number, since it is larger than the sum of its proper divisors (1).

21119647 is an equidigital number, since it uses as much as digits as its factorization.

21119647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 31.

The square root of 21119647 is about 4595.6117111871. The cubic root of 21119647 is about 276.4153891796.

The spelling of 21119647 in words is "twenty-one million, one hundred nineteen thousand, six hundred forty-seven".