21330097 has 2 divisors, whose sum is σ = 21330098. Its totient is φ = 21330096.

The previous prime is 21330083. The next prime is 21330119. The reversal of 21330097 is 79003312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19395216 + 1934881 = 4404^2 + 1391^2 .

It is a cyclic number.

It is not a de Polignac number, because 21330097 - 2⁷ = 21329969 is a prime.

It is not a weakly prime, because it can be changed into another prime (21330047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665048 + 10665049.

It is an arithmetic number, because the mean of its divisors is an integer number (10665049).

Almost surely, 2^21330097 is an apocalyptic number.

It is an amenable number.

21330097 is a deficient number, since it is larger than the sum of its proper divisors (1).

21330097 is an equidigital number, since it uses as much as digits as its factorization.

21330097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1134, while the sum is 25.

The square root of 21330097 is about 4618.4517968687. The cubic root of 21330097 is about 277.3304843547.

The spelling of 21330097 in words is "twenty-one million, three hundred thirty thousand, ninety-seven".