21032897 has 2 divisors, whose sum is σ = 21032898. Its totient is φ = 21032896.

The previous prime is 21032873. The next prime is 21032903. The reversal of 21032897 is 79823012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18395521 + 2637376 = 4289^2 + 1624^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21032897 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21032807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516448 + 10516449.

It is an arithmetic number, because the mean of its divisors is an integer number (10516449).

Almost surely, 2^21032897 is an apocalyptic number.

It is an amenable number.

21032897 is a deficient number, since it is larger than the sum of its proper divisors (1).

21032897 is an equidigital number, since it uses as much as digits as its factorization.

21032897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 21032897 is about 4586.1636473201. The cubic root of 21032897 is about 276.0364064906.

The spelling of 21032897 in words is "twenty-one million, thirty-two thousand, eight hundred ninety-seven".