1012221022121 has 4 divisors (see below), whose sum is σ = 1012323266244. Its totient is φ = 1012118778000.

The previous prime is 1012221022009. The next prime is 1012221022129. The reversal of 1012221022121 is 1212201222101.

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 686476874521 + 325744147600 = 828539^2 + 570740^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012221022121 - 2³⁸ = 737343115177 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1012221022121.

It is not an unprimeable number, because it can be changed into a prime (1012221022129) 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, 51107210 + ... + 51127011.

It is an arithmetic number, because the mean of its divisors is an integer number (253080816561).

Almost surely, 2^{1012221022121} is an apocalyptic number.

It is an amenable number.

1012221022121 is a deficient number, since it is larger than the sum of its proper divisors (102244123).

1012221022121 is an equidigital number, since it uses as much as digits as its factorization.

1012221022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102244122.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1012221022121 its reverse (1212201222101), we get a palindrome (2224422244222).

The spelling of 1012221022121 in words is "one trillion, twelve billion, two hundred twenty-one million, twenty-two thousand, one hundred twenty-one".