201213111 has 16 divisors (see below), whose sum is σ = 295269120. Its totient is φ = 120865920.

The previous prime is 201213101. The next prime is 201213121. The reversal of 201213111 is 111312102.

It is an interprime number because it is at equal distance from previous prime (201213101) and next prime (201213121).

It is not a de Polignac number, because 201213111 - 2¹⁷ = 201082039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201213101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23251 + ... + 30708.

It is an arithmetic number, because the mean of its divisors is an integer number (18454320).

Almost surely, 2^201213111 is an apocalyptic number.

201213111 is a deficient number, since it is larger than the sum of its proper divisors (94056009).

201213111 is a wasteful number, since it uses less digits than its factorization.

201213111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54086.

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

The square root of 201213111 is about 14184.9607331145. The cubic root of 201213111 is about 585.9835510842.

Adding to 201213111 its reverse (111312102), we get a palindrome (312525213).

It can be divided in two parts, 20121 and 3111, that added together give a palindrome (23232).

The spelling of 201213111 in words is "two hundred one million, two hundred thirteen thousand, one hundred eleven".