21044797 has 2 divisors, whose sum is σ = 21044798. Its totient is φ = 21044796.

The previous prime is 21044791. The next prime is 21044813. The reversal of 21044797 is 79744012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12348196 + 8696601 = 3514^2 + 2949^2 .

It is a cyclic number.

It is not a de Polignac number, because 21044797 - 2¹⁹ = 20520509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21044791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10522398 + 10522399.

It is an arithmetic number, because the mean of its divisors is an integer number (10522399).

Almost surely, 2^21044797 is an apocalyptic number.

It is an amenable number.

21044797 is a deficient number, since it is larger than the sum of its proper divisors (1).

21044797 is an equidigital number, since it uses as much as digits as its factorization.

21044797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 21044797 is about 4587.4608445195. The cubic root of 21044797 is about 276.0884553348.

The spelling of 21044797 in words is "twenty-one million, forty-four thousand, seven hundred ninety-seven".