10221011212121 has 2 divisors, whose sum is σ = 10221011212122. Its totient is φ = 10221011212120.

The previous prime is 10221011212079. The next prime is 10221011212199. The reversal of 10221011212121 is 12121211012201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8009262244096 + 2211748968025 = 2830064^2 + 1487195^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10221011212121 is a prime.

It is a super-3 number, since 3×10221011212121³ (a number of 40 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 10221011212121.

It is not a weakly prime, because it can be changed into another prime (10221011212721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5110505606060 + 5110505606061.

It is an arithmetic number, because the mean of its divisors is an integer number (5110505606061).

Almost surely, 2^{10221011212121} is an apocalyptic number.

It is an amenable number.

10221011212121 is a deficient number, since it is larger than the sum of its proper divisors (1).

10221011212121 is an equidigital number, since it uses as much as digits as its factorization.

10221011212121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 10221011212121 its reverse (12121211012201), we get a palindrome (22342222224322).

The spelling of 10221011212121 in words is "ten trillion, two hundred twenty-one billion, eleven million, two hundred twelve thousand, one hundred twenty-one".