1121012012221 has 4 divisors (see below), whose sum is σ = 1121345550844. Its totient is φ = 1120678473600.

The previous prime is 1121012012179. The next prime is 1121012012273. The reversal of 1121012012221 is 1222102101211.

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 831579848100 + 289432164121 = 911910^2 + 537989^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121012012221 - 2¹⁹ = 1121011487933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1121012012195 and 1121012012204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121012012521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166764270 + ... + 166770991.

It is an arithmetic number, because the mean of its divisors is an integer number (280336387711).

Almost surely, 2^{1121012012221} is an apocalyptic number.

It is an amenable number.

1121012012221 is a deficient number, since it is larger than the sum of its proper divisors (333538623).

1121012012221 is an equidigital number, since it uses as much as digits as its factorization.

1121012012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333538622.

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

Adding to 1121012012221 its reverse (1222102101211), we get a palindrome (2343114113432).

The spelling of 1121012012221 in words is "one trillion, one hundred twenty-one billion, twelve million, twelve thousand, two hundred twenty-one".