1212102121221 has 24 divisors (see below), whose sum is σ = 1827013930560. Its totient is φ = 772901940096.

The previous prime is 1212102121213. The next prime is 1212102121247. The reversal of 1212102121221 is 1221212012121.

1212102121221 is a `hidden beast` number, since 1 + 21 + 210 + 212 + 1 + 221 = 666.

It is not a de Polignac number, because 1212102121221 - 2³ = 1212102121213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212102121194 and 1212102121203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212102121271) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5357490 + ... + 5579148.

It is an arithmetic number, because the mean of its divisors is an integer number (76125580440).

Almost surely, 2^{1212102121221} is an apocalyptic number.

It is an amenable number.

1212102121221 is a deficient number, since it is larger than the sum of its proper divisors (614911809339).

1212102121221 is a wasteful number, since it uses less digits than its factorization.

1212102121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248105 (or 248102 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1212102121221 its reverse (1221212012121), we get a palindrome (2433314133342).

The spelling of 1212102121221 in words is "one trillion, two hundred twelve billion, one hundred two million, one hundred twenty-one thousand, two hundred twenty-one".