1021120222021 has 4 divisors (see below), whose sum is σ = 1081186117452. Its totient is φ = 961054326592.

The previous prime is 1021120222019. The next prime is 1021120222027. The reversal of 1021120222021 is 1202220211201.

It is a happy number.

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 539152432900 + 481967789121 = 734270^2 + 694239^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021120222021 - 2¹ = 1021120222019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021120221986 and 1021120222004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021120222027) 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, 30032947690 + ... + 30032947723.

It is an arithmetic number, because the mean of its divisors is an integer number (270296529363).

Almost surely, 2^{1021120222021} is an apocalyptic number.

It is an amenable number.

1021120222021 is a deficient number, since it is larger than the sum of its proper divisors (60065895431).

1021120222021 is an equidigital number, since it uses as much as digits as its factorization.

1021120222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60065895430.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1021120222021 its reverse (1202220211201), we get a palindrome (2223340433222).

The spelling of 1021120222021 in words is "one trillion, twenty-one billion, one hundred twenty million, two hundred twenty-two thousand, twenty-one".