10111221021221 has 4 divisors (see below), whose sum is σ = 10113755801100. Its totient is φ = 10108686241344.

The previous prime is 10111221021197. The next prime is 10111221021263. The reversal of 10111221021221 is 12212012211101.

10111221021221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 6818861577025 + 3292359444196 = 2611295^2 + 1814486^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10111221021221 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 10111221021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10111221024221) 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, 1267383956 + ... + 1267391933.

It is an arithmetic number, because the mean of its divisors is an integer number (2528438950275).

Almost surely, 2^{10111221021221} is an apocalyptic number.

It is an amenable number.

10111221021221 is a deficient number, since it is larger than the sum of its proper divisors (2534779879).

10111221021221 is an equidigital number, since it uses as much as digits as its factorization.

10111221021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2534779878.

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

Adding to 10111221021221 its reverse (12212012211101), we get a palindrome (22323233232322).

The spelling of 10111221021221 in words is "ten trillion, one hundred eleven billion, two hundred twenty-one million, twenty-one thousand, two hundred twenty-one".