201211155 has 32 divisors (see below), whose sum is σ = 358341120. Its totient is φ = 107123040.

The previous prime is 201211139. The next prime is 201211169. The reversal of 201211155 is 551112102.

It is not a de Polignac number, because 201211155 - 2⁴ = 201211139 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 110200 + ... + 112010.

It is an arithmetic number, because the mean of its divisors is an integer number (11198160).

Almost surely, 2^201211155 is an apocalyptic number.

201211155 is a deficient number, since it is larger than the sum of its proper divisors (157129965).

201211155 is a wasteful number, since it uses less digits than its factorization.

201211155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2648 (or 2642 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

The square root of 201211155 is about 14184.8917866863. The cubic root of 201211155 is about 585.9816522889.

Adding to 201211155 its reverse (551112102), we get a palindrome (752323257).

The spelling of 201211155 in words is "two hundred one million, two hundred eleven thousand, one hundred fifty-five".