1212213201 has 4 divisors (see below), whose sum is σ = 1616284272. Its totient is φ = 808142132.

The previous prime is 1212213193. The next prime is 1212213227. The reversal of 1212213201 is 1023122121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1212213201 - 2³ = 1212213193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1212213241) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 202035531 + ... + 202035536.

It is an arithmetic number, because the mean of its divisors is an integer number (404071068).

Almost surely, 2^1212213201 is an apocalyptic number.

It is an amenable number.

1212213201 is a deficient number, since it is larger than the sum of its proper divisors (404071071).

1212213201 is an equidigital number, since it uses as much as digits as its factorization.

1212213201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404071070.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1212213201 is about 34816.8522557683. The cubic root of 1212213201 is about 1066.2515357998.

Adding to 1212213201 its reverse (1023122121), we get a palindrome (2235335322).

The spelling of 1212213201 in words is "one billion, two hundred twelve million, two hundred thirteen thousand, two hundred one".