21320183 has 2 divisors, whose sum is σ = 21320184. Its totient is φ = 21320182.

The previous prime is 21320107. The next prime is 21320197. The reversal of 21320183 is 38102312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21320183 - 2¹⁶ = 21254647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21320083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660091 + 10660092.

It is an arithmetic number, because the mean of its divisors is an integer number (10660092).

Almost surely, 2^21320183 is an apocalyptic number.

21320183 is a deficient number, since it is larger than the sum of its proper divisors (1).

21320183 is an equidigital number, since it uses as much as digits as its factorization.

21320183 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 21320183 is about 4617.3783687283. The cubic root of 21320183 is about 277.2875109526.

Adding to 21320183 its reverse (38102312), we get a palindrome (59422495).

The spelling of 21320183 in words is "twenty-one million, three hundred twenty thousand, one hundred eighty-three".