1212210202221 has 24 divisors (see below), whose sum is σ = 1850134777920. Its totient is φ = 762695364096.

The previous prime is 1212210202219. The next prime is 1212210202237. The reversal of 1212210202221 is 1222020122121.

It is a happy number.

1212210202221 is a `hidden beast` number, since 1 + 21 + 221 + 0 + 202 + 221 = 666.

It is not a de Polignac number, because 1212210202221 - 2¹ = 1212210202219 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1212210202194 and 1212210202203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212210202421) 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 23 ways as a sum of consecutive naturals, for example, 13432116 + ... + 13522061.

It is an arithmetic number, because the mean of its divisors is an integer number (77088949080).

Almost surely, 2^{1212210202221} is an apocalyptic number.

It is an amenable number.

1212210202221 is a deficient number, since it is larger than the sum of its proper divisors (637924575699).

1212210202221 is a wasteful number, since it uses less digits than its factorization.

1212210202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26954465 (or 26954462 counting only the distinct ones).

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

Adding to 1212210202221 its reverse (1222020122121), we get a palindrome (2434230324342).

The spelling of 1212210202221 in words is "one trillion, two hundred twelve billion, two hundred ten million, two hundred two thousand, two hundred twenty-one".