21532097 has 2 divisors, whose sum is σ = 21532098. Its totient is φ = 21532096.

The previous prime is 21532087. The next prime is 21532169. The reversal of 21532097 is 79023512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21492496 + 39601 = 4636^2 + 199^2 .

It is a cyclic number.

It is not a de Polignac number, because 21532097 - 2⁶ = 21532033 is a prime.

It is not a weakly prime, because it can be changed into another prime (21532067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10766048 + 10766049.

It is an arithmetic number, because the mean of its divisors is an integer number (10766049).

Almost surely, 2^21532097 is an apocalyptic number.

It is an amenable number.

21532097 is a deficient number, since it is larger than the sum of its proper divisors (1).

21532097 is an equidigital number, since it uses as much as digits as its factorization.

21532097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 21532097 is about 4640.2690654745. The cubic root of 21532097 is about 278.2031923733.

The spelling of 21532097 in words is "twenty-one million, five hundred thirty-two thousand, ninety-seven".