1012121010221 has 16 divisors (see below), whose sum is σ = 1072826726400. Its totient is φ = 951545726208.

The previous prime is 1012121010217. The next prime is 1012121010247. The reversal of 1012121010221 is 1220101212101.

It is a cyclic number.

It is not a de Polignac number, because 1012121010221 - 2² = 1012121010217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1012121010196 and 1012121010205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012121010211) 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 15 ways as a sum of consecutive naturals, for example, 93251831 + ... + 93262683.

It is an arithmetic number, because the mean of its divisors is an integer number (67051670400).

Almost surely, 2^{1012121010221} is an apocalyptic number.

It is an amenable number.

1012121010221 is a deficient number, since it is larger than the sum of its proper divisors (60705716179).

1012121010221 is a wasteful number, since it uses less digits than its factorization.

1012121010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16348.

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

Adding to 1012121010221 its reverse (1220101212101), we get a palindrome (2232222222322).

The spelling of 1012121010221 in words is "one trillion, twelve billion, one hundred twenty-one million, ten thousand, two hundred twenty-one".