21030897 has 8 divisors (see below), whose sum is σ = 28077280. Its totient is φ = 14002560.

The previous prime is 21030881. The next prime is 21030899. The reversal of 21030897 is 79803012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21030897 - 2⁴ = 21030881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21030899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1504 + ... + 6657.

It is an arithmetic number, because the mean of its divisors is an integer number (3509660).

Almost surely, 2^21030897 is an apocalyptic number.

It is an amenable number.

21030897 is a deficient number, since it is larger than the sum of its proper divisors (7046383).

21030897 is an equidigital number, since it uses as much as digits as its factorization.

21030897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9023.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 21030897 is about 4585.9455949673. The cubic root of 21030897 is about 276.0276568589.

The spelling of 21030897 in words is "twenty-one million, thirty thousand, eight hundred ninety-seven".