21733001 has 2 divisors, whose sum is σ = 21733002. Its totient is φ = 21733000.

The previous prime is 21732983. The next prime is 21733003. The reversal of 21733001 is 10033712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21529600 + 203401 = 4640^2 + 451^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21733001 is a prime.

Together with 21733003, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21733003) 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 as a sum of consecutive naturals, namely, 10866500 + 10866501.

It is an arithmetic number, because the mean of its divisors is an integer number (10866501).

Almost surely, 2^21733001 is an apocalyptic number.

It is an amenable number.

21733001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21733001 is an equidigital number, since it uses as much as digits as its factorization.

21733001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126, while the sum is 17.

The square root of 21733001 is about 4661.8666862106. The cubic root of 21733001 is about 279.0657681655.

Adding to 21733001 its reverse (10033712), we get a palindrome (31766713).

The spelling of 21733001 in words is "twenty-one million, seven hundred thirty-three thousand, one".