1212201000221 has 4 divisors (see below), whose sum is σ = 1237992510912. Its totient is φ = 1186409489532.

The previous prime is 1212201000209. The next prime is 1212201000253. The reversal of 1212201000221 is 1220001022121.

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 1212201000221 - 2¹⁰ = 1212200999197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212201000196 and 1212201000205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212201000271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12895755275 + ... + 12895755368.

It is an arithmetic number, because the mean of its divisors is an integer number (309498127728).

Almost surely, 2^{1212201000221} is an apocalyptic number.

It is an amenable number.

1212201000221 is a deficient number, since it is larger than the sum of its proper divisors (25791510691).

1212201000221 is an equidigital number, since it uses as much as digits as its factorization.

1212201000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25791510690.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1212201000221 its reverse (1220001022121), we get a palindrome (2432202022342).

The spelling of 1212201000221 in words is "one trillion, two hundred twelve billion, two hundred one million, two hundred twenty-one", and thus it is an aban number.