1020022011221 has 4 divisors (see below), whose sum is σ = 1020466855212. Its totient is φ = 1019577167232.

The previous prime is 1020022011193. The next prime is 1020022011233. The reversal of 1020022011221 is 1221102200201.

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 111231588196 + 908790423025 = 333514^2 + 953305^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020022011221 - 2⁶ = 1020022011157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020022011196 and 1020022011205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020022011121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222418556 + ... + 222423141.

It is an arithmetic number, because the mean of its divisors is an integer number (255116713803).

Almost surely, 2^{1020022011221} is an apocalyptic number.

It is an amenable number.

1020022011221 is a deficient number, since it is larger than the sum of its proper divisors (444843991).

1020022011221 is an equidigital number, since it uses as much as digits as its factorization.

1020022011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444843990.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1020022011221 its reverse (1221102200201), we get a palindrome (2241124211422).

The spelling of 1020022011221 in words is "one trillion, twenty billion, twenty-two million, eleven thousand, two hundred twenty-one".