1212211208 has 32 divisors (see below), whose sum is σ = 2454375000. Its totient is φ = 557964288.

The previous prime is 1212211201. The next prime is 1212211213. The reversal of 1212211208 is 8021122121.

It can be written as a sum of positive squares in 4 ways, for example, as 943841284 + 268369924 = 30722^2 + 16382^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1212211208.

It is not an unprimeable number, because it can be changed into a prime (1212211201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23168 + ... + 54416.

Almost surely, 2^1212211208 is an apocalyptic number.

It is an amenable number.

1212211208 is an abundant number, since it is smaller than the sum of its proper divisors (1242163792).

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

1212211208 is a wasteful number, since it uses less digits than its factorization.

1212211208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31641 (or 31637 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 1212211208 is about 34816.8236345592. The cubic root of 1212211208 is about 1066.2509514580.

Adding to 1212211208 its reverse (8021122121), we get a palindrome (9233333329).

The spelling of 1212211208 in words is "one billion, two hundred twelve million, two hundred eleven thousand, two hundred eight".