1212110111221 has 8 divisors (see below), whose sum is σ = 1234489925088. Its totient is φ = 1189811238000.

The previous prime is 1212110111183. The next prime is 1212110111231. The reversal of 1212110111221 is 1221110112121.

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 1212110111221 - 2⁹ = 1212110110709 is a prime.

It is a super-2 number, since 2×1212110111221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212110111195 and 1212110111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212110111231) 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, 20204935 + ... + 20264836.

It is an arithmetic number, because the mean of its divisors is an integer number (154311240636).

Almost surely, 2^{1212110111221} is an apocalyptic number.

It is an amenable number.

1212110111221 is a deficient number, since it is larger than the sum of its proper divisors (22379813867).

1212110111221 is an equidigital number, since it uses as much as digits as its factorization.

1212110111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40470323.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 1212110111221 its reverse (1221110112121), we get a palindrome (2433220223342).

The spelling of 1212110111221 in words is "one trillion, two hundred twelve billion, one hundred ten million, one hundred eleven thousand, two hundred twenty-one".