1212221220201 has 6 divisors (see below), whose sum is σ = 1750986206970. Its totient is φ = 808147480128.

The previous prime is 1212221220193. The next prime is 1212221220241. The reversal of 1212221220201 is 1020221222121.

It is a happy number.

1212221220201 is a `hidden beast` number, since 1 + 21 + 2 + 221 + 220 + 201 = 666.

It can be written as a sum of positive squares in only one way, i.e., 641682704601 + 570538515600 = 801051^2 + 755340^2 .

It is not a de Polignac number, because 1212221220201 - 2³ = 1212221220193 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1212221220241) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67345623336 + ... + 67345623353.

It is an arithmetic number, because the mean of its divisors is an integer number (291831034495).

Almost surely, 2^{1212221220201} is an apocalyptic number.

It is an amenable number.

1212221220201 is a deficient number, since it is larger than the sum of its proper divisors (538764986769).

1212221220201 is a wasteful number, since it uses less digits than its factorization.

1212221220201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134691246695 (or 134691246692 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1212221220201 its reverse (1020221222121), we get a palindrome (2232442442322).

The spelling of 1212221220201 in words is "one trillion, two hundred twelve billion, two hundred twenty-one million, two hundred twenty thousand, two hundred one".