1212101020121 has 4 divisors (see below), whose sum is σ = 1212111605172. Its totient is φ = 1212090435072.

The previous prime is 1212101020111. The next prime is 1212101020159. The reversal of 1212101020121 is 1210201012121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38917425625 + 1173183594496 = 197275^2 + 1083136^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212101020121 - 2¹⁸ = 1212100757977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1212101020096 and 1212101020105.

It is not an unprimeable number, because it can be changed into a prime (1212101020111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5118860 + ... + 5350413.

It is an arithmetic number, because the mean of its divisors is an integer number (303027901293).

Almost surely, 2^{1212101020121} is an apocalyptic number.

It is an amenable number.

1212101020121 is a deficient number, since it is larger than the sum of its proper divisors (10585051).

1212101020121 is a wasteful number, since it uses less digits than its factorization.

1212101020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10585050.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1212101020121 its reverse (1210201012121), we get a palindrome (2422302032242).

The spelling of 1212101020121 in words is "one trillion, two hundred twelve billion, one hundred one million, twenty thousand, one hundred twenty-one".