213331001 has 4 divisors (see below), whose sum is σ = 229741092. Its totient is φ = 196920912.

The previous prime is 213330959. The next prime is 213331007. The reversal of 213331001 is 100133312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71149225 + 142181776 = 8435^2 + 11924^2 .

It is a cyclic number.

It is not a de Polignac number, because 213331001 - 2¹⁸ = 213068857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (213331007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8205026 + ... + 8205051.

It is an arithmetic number, because the mean of its divisors is an integer number (57435273).

Almost surely, 2^213331001 is an apocalyptic number.

It is an amenable number.

213331001 is a deficient number, since it is larger than the sum of its proper divisors (16410091).

213331001 is a wasteful number, since it uses less digits than its factorization.

213331001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16410090.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 213331001 is about 14605.8550246126. The cubic root of 213331001 is about 597.5184553393.

Adding to 213331001 its reverse (100133312), we get a palindrome (313464313).

The spelling of 213331001 in words is "two hundred thirteen million, three hundred thirty-one thousand, one".