213021001 has 2 divisors, whose sum is σ = 213021002. Its totient is φ = 213021000.

The previous prime is 213020993. The next prime is 213021013. The reversal of 213021001 is 100120312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159365376 + 53655625 = 12624^2 + 7325^2 .

It is a cyclic number.

It is not a de Polignac number, because 213021001 - 2³ = 213020993 is a prime.

It is not a weakly prime, because it can be changed into another prime (213021041) 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, 106510500 + 106510501.

It is an arithmetic number, because the mean of its divisors is an integer number (106510501).

Almost surely, 2^213021001 is an apocalyptic number.

It is an amenable number.

213021001 is a deficient number, since it is larger than the sum of its proper divisors (1).

213021001 is an equidigital number, since it uses as much as digits as its factorization.

213021001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 213021001 is about 14595.2389839975. The cubic root of 213021001 is about 597.2288888677.

Adding to 213021001 its reverse (100120312), we get a palindrome (313141313).

The spelling of 213021001 in words is "two hundred thirteen million, twenty-one thousand, one".