1210221012121 has 8 divisors (see below), whose sum is σ = 1321534202688. Its totient is φ = 1099123338000.

The previous prime is 1210221012109. The next prime is 1210221012179. The reversal of 1210221012121 is 1212101220121.

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 1210221012121 - 2⁵ = 1210221012089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1210221012095 and 1210221012104.

It is not an unprimeable number, because it can be changed into a prime (1210221012821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53867365 + ... + 53889826.

It is an arithmetic number, because the mean of its divisors is an integer number (165191775336).

Almost surely, 2^{1210221012121} is an apocalyptic number.

1210221012121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1210221012121 is a deficient number, since it is larger than the sum of its proper divisors (111313190567).

1210221012121 is a wasteful number, since it uses less digits than its factorization.

1210221012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107758223.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1210221012121 its reverse (1212101220121), we get a palindrome (2422322232242).

The spelling of 1210221012121 in words is "one trillion, two hundred ten billion, two hundred twenty-one million, twelve thousand, one hundred twenty-one".