1212302221 has 16 divisors (see below), whose sum is σ = 1327803904. Its totient is φ = 1100049984.

The previous prime is 1212302219. The next prime is 1212302257. The reversal of 1212302221 is 1222032121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1212302221 - 2¹ = 1212302219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212302195 and 1212302204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212302281) 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, 527551 + ... + 529843.

It is an arithmetic number, because the mean of its divisors is an integer number (82987744).

Almost surely, 2^1212302221 is an apocalyptic number.

It is an amenable number.

1212302221 is a deficient number, since it is larger than the sum of its proper divisors (115501683).

1212302221 is a wasteful number, since it uses less digits than its factorization.

1212302221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2980.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1212302221 is about 34818.1306362073. The cubic root of 1212302221 is about 1066.2776355508.

Adding to 1212302221 its reverse (1222032121), we get a palindrome (2434334342).

The spelling of 1212302221 in words is "one billion, two hundred twelve million, three hundred two thousand, two hundred twenty-one".