21340093 has 2 divisors, whose sum is σ = 21340094. Its totient is φ = 21340092.

The previous prime is 21340091. The next prime is 21340141. The reversal of 21340093 is 39004312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19035769 + 2304324 = 4363^2 + 1518^2 .

It is a cyclic number.

It is not a de Polignac number, because 21340093 - 2¹ = 21340091 is a prime.

Together with 21340091, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21340091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10670046 + 10670047.

It is an arithmetic number, because the mean of its divisors is an integer number (10670047).

Almost surely, 2^21340093 is an apocalyptic number.

It is an amenable number.

21340093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21340093 is an equidigital number, since it uses as much as digits as its factorization.

21340093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 21340093 is about 4619.5338509421. The cubic root of 21340093 is about 277.3737997162.

The spelling of 21340093 in words is "twenty-one million, three hundred forty thousand, ninety-three".