21797003 has 2 divisors, whose sum is σ = 21797004. Its totient is φ = 21797002.

The previous prime is 21796981. The next prime is 21797023. The reversal of 21797003 is 30079712.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21797003 - 2²⁴ = 5019787 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21797023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10898501 + 10898502.

It is an arithmetic number, because the mean of its divisors is an integer number (10898502).

Almost surely, 2^21797003 is an apocalyptic number.

21797003 is a deficient number, since it is larger than the sum of its proper divisors (1).

21797003 is an equidigital number, since it uses as much as digits as its factorization.

21797003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2646, while the sum is 29.

The square root of 21797003 is about 4668.7260575022. The cubic root of 21797003 is about 279.3394420293.

The spelling of 21797003 in words is "twenty-one million, seven hundred ninety-seven thousand, three".