201216105 has 24 divisors (see below), whose sum is σ = 353558088. Its totient is φ = 105843456.

The previous prime is 201216091. The next prime is 201216109. The reversal of 201216105 is 501612102.

It can be written as a sum of positive squares in 4 ways, for example, as 3504384 + 197711721 = 1872^2 + 14061^2 .

It is not a de Polignac number, because 201216105 - 2⁸ = 201215849 is a prime.

It is a super-2 number, since 2×201216105² = 80975841822742050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (201216109) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27342 + ... + 33911.

It is an arithmetic number, because the mean of its divisors is an integer number (14731587).

Almost surely, 2^201216105 is an apocalyptic number.

It is an amenable number.

201216105 is a deficient number, since it is larger than the sum of its proper divisors (152341983).

201216105 is a wasteful number, since it uses less digits than its factorization.

201216105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61337 (or 61334 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 201216105 is about 14185.0662670289. The cubic root of 201216105 is about 585.9864574986.

Adding to 201216105 its reverse (501612102), we get a palindrome (702828207).

The spelling of 201216105 in words is "two hundred one million, two hundred sixteen thousand, one hundred five".