1213213211 has 16 divisors (see below), whose sum is σ = 1471104000. Its totient is φ = 976717440.

The previous prime is 1213213193. The next prime is 1213213217. The reversal of 1213213211 is 1123123121.

It is a cyclic number.

It is not a de Polignac number, because 1213213211 - 2⁶ = 1213213147 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1213213211.

It is not an unprimeable number, because it can be changed into a prime (1213213217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49166 + ... + 69596.

It is an arithmetic number, because the mean of its divisors is an integer number (91944000).

Almost surely, 2^1213213211 is an apocalyptic number.

1213213211 is a deficient number, since it is larger than the sum of its proper divisors (257890789).

1213213211 is a wasteful number, since it uses less digits than its factorization.

1213213211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20954.

The product of its digits is 72, while the sum is 17.

The square root of 1213213211 is about 34831.2103005336. The cubic root of 1213213211 is about 1066.5446550654.

Adding to 1213213211 its reverse (1123123121), we get a palindrome (2336336332).

The spelling of 1213213211 in words is "one billion, two hundred thirteen million, two hundred thirteen thousand, two hundred eleven".