21193847 has 2 divisors, whose sum is σ = 21193848. Its totient is φ = 21193846.

The previous prime is 21193841. The next prime is 21193853. The reversal of 21193847 is 74839112.

It is a balanced prime because it is at equal distance from previous prime (21193841) and next prime (21193853).

It is a cyclic number.

It is not a de Polignac number, because 21193847 - 2⁴ = 21193831 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21193841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10596923 + 10596924.

It is an arithmetic number, because the mean of its divisors is an integer number (10596924).

Almost surely, 2^21193847 is an apocalyptic number.

21193847 is a deficient number, since it is larger than the sum of its proper divisors (1).

21193847 is an equidigital number, since it uses as much as digits as its factorization.

21193847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 35.

The square root of 21193847 is about 4603.6775516971. The cubic root of 21193847 is about 276.7387223813.

The spelling of 21193847 in words is "twenty-one million, one hundred ninety-three thousand, eight hundred forty-seven".