1212002221 has 4 divisors (see below), whose sum is σ = 1217073600. Its totient is φ = 1206930844.

The previous prime is 1212002219. The next prime is 1212002237. The reversal of 1212002221 is 1222002121.

It is a happy number.

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 1212002221 - 2¹ = 1212002219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212002201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2535331 + ... + 2535808.

It is an arithmetic number, because the mean of its divisors is an integer number (304268400).

Almost surely, 2^1212002221 is an apocalyptic number.

It is an amenable number.

1212002221 is a deficient number, since it is larger than the sum of its proper divisors (5071379).

1212002221 is an equidigital number, since it uses as much as digits as its factorization.

1212002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5071378.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1212002221 is about 34813.8222693229. The cubic root of 1212002221 is about 1066.1896735242.

Adding to 1212002221 its reverse (1222002121), we get a palindrome (2434004342).

The spelling of 1212002221 in words is "one billion, two hundred twelve million, two thousand, two hundred twenty-one".