1211505212 has 6 divisors (see below), whose sum is σ = 2120134128. Its totient is φ = 605752604.

The previous prime is 1211505199. The next prime is 1211505223. The reversal of 1211505212 is 2125051121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 151438148 + ... + 151438155.

It is an arithmetic number, because the mean of its divisors is an integer number (353355688).

Almost surely, 2^1211505212 is an apocalyptic number.

It is an amenable number.

1211505212 is a deficient number, since it is larger than the sum of its proper divisors (908628916).

1211505212 is a wasteful number, since it uses less digits than its factorization.

1211505212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302876307 (or 302876305 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 1211505212 is about 34806.6834386731. The cubic root of 1211505212 is about 1066.0439151793.

Adding to 1211505212 its reverse (2125051121), we get a palindrome (3336556333).

The spelling of 1211505212 in words is "one billion, two hundred eleven million, five hundred five thousand, two hundred twelve".