211305001 has 2 divisors, whose sum is σ = 211305002. Its totient is φ = 211305000.

The previous prime is 211304999. The next prime is 211305041. The reversal of 211305001 is 100503112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120121600 + 91183401 = 10960^2 + 9549^2 .

It is a cyclic number.

It is not a de Polignac number, because 211305001 - 2¹ = 211304999 is a prime.

It is a super-2 number, since 2×211305001² = 89299606895220002, which contains 22 as substring.

Together with 211304999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (211305041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105652500 + 105652501.

It is an arithmetic number, because the mean of its divisors is an integer number (105652501).

Almost surely, 2^211305001 is an apocalyptic number.

It is an amenable number.

211305001 is a deficient number, since it is larger than the sum of its proper divisors (1).

211305001 is an equidigital number, since it uses as much as digits as its factorization.

211305001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 211305001 is about 14536.3338225290. Note that the first 3 decimals coincide. The cubic root of 211305001 is about 595.6208955328.

Adding to 211305001 its reverse (100503112), we get a palindrome (311808113).

The spelling of 211305001 in words is "two hundred eleven million, three hundred five thousand, one".