1212213204 has 36 divisors (see below), whose sum is σ = 3066140896. Its totient is φ = 403815888.

The previous prime is 1212213193. The next prime is 1212213227. The reversal of 1212213204 is 4023122121.

It is a happy number.

1212213204 is a `hidden beast` number, since 121 + 221 + 320 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

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 in 11 ways as a sum of consecutive naturals, for example, 52257 + ... + 71799.

Almost surely, 2^1212213204 is an apocalyptic number.

It is an amenable number.

1212213204 is an abundant number, since it is smaller than the sum of its proper divisors (1853927692).

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

1212213204 is a wasteful number, since it uses less digits than its factorization.

1212213204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21276 (or 21271 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1212213204 is about 34816.8522988509. The cubic root of 1212213204 is about 1066.2515366793.

Adding to 1212213204 its reverse (4023122121), we get a palindrome (5235335325).

The spelling of 1212213204 in words is "one billion, two hundred twelve million, two hundred thirteen thousand, two hundred four".