21200093 has 2 divisors, whose sum is σ = 21200094. Its totient is φ = 21200092.

The previous prime is 21200083. The next prime is 21200117. The reversal of 21200093 is 39000212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14915044 + 6285049 = 3862^2 + 2507^2 .

It is a cyclic number.

It is not a de Polignac number, because 21200093 - 2⁴ = 21200077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21200083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600046 + 10600047.

It is an arithmetic number, because the mean of its divisors is an integer number (10600047).

Almost surely, 2^21200093 is an apocalyptic number.

It is an amenable number.

21200093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200093 is an equidigital number, since it uses as much as digits as its factorization.

21200093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 21200093 is about 4604.3558724321. The cubic root of 21200093 is about 276.7659054326.

The spelling of 21200093 in words is "twenty-one million, two hundred thousand, ninety-three".