201213101 has 2 divisors, whose sum is σ = 201213102. Its totient is φ = 201213100.

The previous prime is 201213091. The next prime is 201213121. The reversal of 201213101 is 101312102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124300201 + 76912900 = 11149^2 + 8770^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201213101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201213121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100606550 + 100606551.

It is an arithmetic number, because the mean of its divisors is an integer number (100606551).

Almost surely, 2^201213101 is an apocalyptic number.

It is an amenable number.

201213101 is a deficient number, since it is larger than the sum of its proper divisors (1).

201213101 is an equidigital number, since it uses as much as digits as its factorization.

201213101 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 11.

The square root of 201213101 is about 14184.9603806285. The cubic root of 201213101 is about 585.9835413767.

Adding to 201213101 its reverse (101312102), we get a palindrome (302525203).

Subtracting from 201213101 its reverse (101312102), we obtain a palindrome (99900999).

It can be divided in two parts, 20 and 1213101, that added together give a palindrome (1213121).

The spelling of 201213101 in words is "two hundred one million, two hundred thirteen thousand, one hundred one".