10101121212221 has 4 divisors (see below), whose sum is σ = 10878130536252. Its totient is φ = 9324111888192.

The previous prime is 10101121212191. The next prime is 10101121212251. The reversal of 10101121212221 is 12221212110101.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (10101121212191) and next prime (10101121212251).

It can be written as a sum of positive squares in 2 ways, for example, as 6971654071321 + 3129467140900 = 2640389^2 + 1769030^2 .

It is a cyclic number.

It is not a de Polignac number, because 10101121212221 - 2³⁴ = 10083941343037 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 10101121212221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10101121212251) 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, 388504661996 + ... + 388504662021.

It is an arithmetic number, because the mean of its divisors is an integer number (2719532634063).

Almost surely, 2^{10101121212221} is an apocalyptic number.

It is an amenable number.

10101121212221 is a deficient number, since it is larger than the sum of its proper divisors (777009324031).

10101121212221 is an equidigital number, since it uses as much as digits as its factorization.

10101121212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777009324030.

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

Adding to 10101121212221 its reverse (12221212110101), we get a palindrome (22322333322322).

The spelling of 10101121212221 in words is "ten trillion, one hundred one billion, one hundred twenty-one million, two hundred twelve thousand, two hundred twenty-one".