10221202011221 has 4 divisors (see below), whose sum is σ = 10221262482444. Its totient is φ = 10221141540000.

The previous prime is 10221202011151. The next prime is 10221202011239. The reversal of 10221202011221 is 12211020212201.

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 9529167694225 + 692034316996 = 3086935^2 + 831886^2 .

It is a cyclic number.

It is not a de Polignac number, because 10221202011221 - 2¹⁰ = 10221202010197 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 10221202011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10221202011121) 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, 29981360 + ... + 30320361.

It is an arithmetic number, because the mean of its divisors is an integer number (2555315620611).

Almost surely, 2^{10221202011221} is an apocalyptic number.

It is an amenable number.

10221202011221 is a deficient number, since it is larger than the sum of its proper divisors (60471223).

10221202011221 is an equidigital number, since it uses as much as digits as its factorization.

10221202011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60471222.

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

Adding to 10221202011221 its reverse (12211020212201), we get a palindrome (22432222223422).

The spelling of 10221202011221 in words is "ten trillion, two hundred twenty-one billion, two hundred two million, eleven thousand, two hundred twenty-one".