2011121205 has 16 divisors (see below), whose sum is σ = 3223057920. Its totient is φ = 1070843328.

The previous prime is 2011121201. The next prime is 2011121269. The reversal of 2011121205 is 5021211102.

It is not a de Polignac number, because 2011121205 - 2² = 2011121201 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011121201) 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, 100165 + ... + 118554.

It is an arithmetic number, because the mean of its divisors is an integer number (201441120).

Almost surely, 2^2011121205 is an apocalyptic number.

It is an amenable number.

2011121205 is a deficient number, since it is larger than the sum of its proper divisors (1211936715).

2011121205 is a wasteful number, since it uses less digits than its factorization.

2011121205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219340.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 2011121205 is about 44845.5260310323. The cubic root of 2011121205 is about 1262.2520413599.

Adding to 2011121205 its reverse (5021211102), we get a palindrome (7032332307).

The spelling of 2011121205 in words is "two billion, eleven million, one hundred twenty-one thousand, two hundred five".