21223093 has 2 divisors, whose sum is σ = 21223094. Its totient is φ = 21223092.

The previous prime is 21223091. The next prime is 21223141. The reversal of 21223093 is 39032212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10712529 + 10510564 = 3273^2 + 3242^2 .

It is a cyclic number.

It is not a de Polignac number, because 21223093 - 2¹ = 21223091 is a prime.

Together with 21223091, 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 (21223091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611546 + 10611547.

It is an arithmetic number, because the mean of its divisors is an integer number (10611547).

Almost surely, 2^21223093 is an apocalyptic number.

It is an amenable number.

21223093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21223093 is an equidigital number, since it uses as much as digits as its factorization.

21223093 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 21223093 is about 4606.8528302953. The cubic root of 21223093 is about 276.8659571193.

The spelling of 21223093 in words is "twenty-one million, two hundred twenty-three thousand, ninety-three".