10221220111021 has 4 divisors (see below), whose sum is σ = 10314992772700. Its totient is φ = 10127447449344.

The previous prime is 10221220110961. The next prime is 10221220111033. The reversal of 10221220111021 is 12011102212201.

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 5019235333225 + 5201984777796 = 2240365^2 + 2280786^2 .

It is a cyclic number.

It is not a de Polignac number, because 10221220111021 - 2³⁵ = 10186860372653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10221220110986 and 10221220111004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10221220141021) 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, 46886330676 + ... + 46886330893.

It is an arithmetic number, because the mean of its divisors is an integer number (2578748193175).

Almost surely, 2^{10221220111021} is an apocalyptic number.

It is an amenable number.

10221220111021 is a deficient number, since it is larger than the sum of its proper divisors (93772661679).

10221220111021 is an equidigital number, since it uses as much as digits as its factorization.

10221220111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93772661678.

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

Adding to 10221220111021 its reverse (12011102212201), we get a palindrome (22232322323222).

The spelling of 10221220111021 in words is "ten trillion, two hundred twenty-one billion, two hundred twenty million, one hundred eleven thousand, twenty-one".