21200147 has 2 divisors, whose sum is σ = 21200148. Its totient is φ = 21200146.

The previous prime is 21200129. The next prime is 21200171. The reversal of 21200147 is 74100212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21200147 - 2⁶ = 21200083 is a prime.

It is not a weakly prime, because it can be changed into another prime (21200117) 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, 10600073 + 10600074.

It is an arithmetic number, because the mean of its divisors is an integer number (10600074).

Almost surely, 2^21200147 is an apocalyptic number.

21200147 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200147 is an equidigital number, since it uses as much as digits as its factorization.

21200147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 21200147 is about 4604.3617364408. The cubic root of 21200147 is about 276.7661404213.

Adding to 21200147 its reverse (74100212), we get a palindrome (95300359).

The spelling of 21200147 in words is "twenty-one million, two hundred thousand, one hundred forty-seven".