21238093 has 2 divisors, whose sum is σ = 21238094. Its totient is φ = 21238092.

The previous prime is 21238073. The next prime is 21238097. The reversal of 21238093 is 39083212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15468489 + 5769604 = 3933^2 + 2402^2 .

It is a cyclic number.

It is not a de Polignac number, because 21238093 - 2²¹ = 19140941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21238097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10619046 + 10619047.

It is an arithmetic number, because the mean of its divisors is an integer number (10619047).

Almost surely, 2^21238093 is an apocalyptic number.

It is an amenable number.

21238093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21238093 is an equidigital number, since it uses as much as digits as its factorization.

21238093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 21238093 is about 4608.4805521994. The cubic root of 21238093 is about 276.9311692812.

The spelling of 21238093 in words is "twenty-one million, two hundred thirty-eight thousand, ninety-three".