21313001 has 2 divisors, whose sum is σ = 21313002. Its totient is φ = 21313000.

The previous prime is 21312979. The next prime is 21313021. The reversal of 21313001 is 10031312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17007376 + 4305625 = 4124^2 + 2075^2 .

It is a cyclic number.

It is not a de Polignac number, because 21313001 - 2¹⁴ = 21296617 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21313021) 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, 10656500 + 10656501.

It is an arithmetic number, because the mean of its divisors is an integer number (10656501).

Almost surely, 2^21313001 is an apocalyptic number.

It is an amenable number.

21313001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21313001 is an equidigital number, since it uses as much as digits as its factorization.

21313001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 21313001 is about 4616.6005891781. The cubic root of 21313001 is about 277.2563714050.

Adding to 21313001 its reverse (10031312), we get a palindrome (31344313).

The spelling of 21313001 in words is "twenty-one million, three hundred thirteen thousand, one".