2212121205 has 32 divisors (see below), whose sum is σ = 4494470400. Its totient is φ = 1011254976.

The previous prime is 2212121203. The next prime is 2212121237. The reversal of 2212121205 is 5021212122.

2212121205 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2212121205 - 2¹ = 2212121203 is a prime.

It is a super-2 number, since 2×2212121205² = 9786960451221304050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2212121203) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1169490 + ... + 1171379.

It is an arithmetic number, because the mean of its divisors is an integer number (140452200).

Almost surely, 2^2212121205 is an apocalyptic number.

It is an amenable number.

2212121205 is an abundant number, since it is smaller than the sum of its proper divisors (2282349195).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2212121205 is a wasteful number, since it uses less digits than its factorization.

2212121205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2340890 (or 2340884 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 2212121205 is about 47033.1925877885. The cubic root of 2212121205 is about 1302.9756697575.

Adding to 2212121205 its reverse (5021212122), we get a palindrome (7233333327).

The spelling of 2212121205 in words is "two billion, two hundred twelve million, one hundred twenty-one thousand, two hundred five".