1212221212201 has 4 divisors (see below), whose sum is σ = 1251325122304. Its totient is φ = 1173117302100.

The previous prime is 1212221212199. The next prime is 1212221212247. The reversal of 1212221212201 is 1022121222121.

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 1212221212201 - 2¹ = 1212221212199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212221212801) 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, 19551955005 + ... + 19551955066.

It is an arithmetic number, because the mean of its divisors is an integer number (312831280576).

Almost surely, 2^{1212221212201} is an apocalyptic number.

It is an amenable number.

1212221212201 is a deficient number, since it is larger than the sum of its proper divisors (39103910103).

1212221212201 is an equidigital number, since it uses as much as digits as its factorization.

1212221212201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39103910102.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1212221212201 its reverse (1022121222121), we get a palindrome (2234342434322).

The spelling of 1212221212201 in words is "one trillion, two hundred twelve billion, two hundred twenty-one million, two hundred twelve thousand, two hundred one".