10221210221221 has 4 divisors (see below), whose sum is σ = 10221421831852. Its totient is φ = 10220998610592.

The previous prime is 10221210221087. The next prime is 10221210221227. The reversal of 10221210221221 is 12212201212201.

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 6060528170596 + 4160682050625 = 2461814^2 + 2039775^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10221210221221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10221210221227) 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, 105732846 + ... + 105829471.

It is an arithmetic number, because the mean of its divisors is an integer number (2555355457963).

Almost surely, 2^{10221210221221} is an apocalyptic number.

It is an amenable number.

10221210221221 is a deficient number, since it is larger than the sum of its proper divisors (211610631).

10221210221221 is an equidigital number, since it uses as much as digits as its factorization.

10221210221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211610630.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 10221210221221 its reverse (12212201212201), we get a palindrome (22433411433422).

The spelling of 10221210221221 in words is "ten trillion, two hundred twenty-one billion, two hundred ten million, two hundred twenty-one thousand, two hundred twenty-one".