10221120020021 has 4 divisors (see below), whose sum is σ = 10221358578732. Its totient is φ = 10220881461312.

The previous prime is 10221120020009. The next prime is 10221120020119. The reversal of 10221120020021 is 12002002112201.

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 8318113564996 + 1903006455025 = 2884114^2 + 1379495^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10221120020021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10221120019978 and 10221120020005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10221120020521) 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, 119215076 + ... + 119300781.

It is an arithmetic number, because the mean of its divisors is an integer number (2555339644683).

Almost surely, 2^{10221120020021} is an apocalyptic number.

It is an amenable number.

10221120020021 is a deficient number, since it is larger than the sum of its proper divisors (238558711).

10221120020021 is an equidigital number, since it uses as much as digits as its factorization.

10221120020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238558710.

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

Adding to 10221120020021 its reverse (12002002112201), we get a palindrome (22223122132222).

The spelling of 10221120020021 in words is "ten trillion, two hundred twenty-one billion, one hundred twenty million, twenty thousand, twenty-one".