1212110121221 has 8 divisors (see below), whose sum is σ = 1260343375104. Its totient is φ = 1164447675360.

The previous prime is 1212110121197. The next prime is 1212110121251. The reversal of 1212110121221 is 1221210112121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1212110121221 - 2¹⁴ = 1212110104837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212110121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212110121251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142697675 + ... + 142706168.

It is an arithmetic number, because the mean of its divisors is an integer number (157542921888).

Almost surely, 2^{1212110121221} is an apocalyptic number.

It is an amenable number.

1212110121221 is a deficient number, since it is larger than the sum of its proper divisors (48233253883).

1212110121221 is a wasteful number, since it uses less digits than its factorization.

1212110121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285404011.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1212110121221 its reverse (1221210112121), we get a palindrome (2433320233342).

It can be divided in two parts, 1212110 and 121221, that added together give a palindrome (1333331).

The spelling of 1212110121221 in words is "one trillion, two hundred twelve billion, one hundred ten million, one hundred twenty-one thousand, two hundred twenty-one".