10021111012221 has 32 divisors (see below), whose sum is σ = 13567931535360. Its totient is φ = 6578493014016.

The previous prime is 10021111012219. The next prime is 10021111012249. The reversal of 10021111012221 is 12221011112001.

It is a happy number.

It is not a de Polignac number, because 10021111012221 - 2¹ = 10021111012219 is a prime.

It is a super-2 number, since 2×10021111012221² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 10021111012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10021111012291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26938275 + ... + 27307743.

It is an arithmetic number, because the mean of its divisors is an integer number (423997860480).

Almost surely, 2^{10021111012221} is an apocalyptic number.

It is an amenable number.

10021111012221 is a deficient number, since it is larger than the sum of its proper divisors (3546820523139).

10021111012221 is a wasteful number, since it uses less digits than its factorization.

10021111012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370133.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 10021111012221 its reverse (12221011112001), we get a palindrome (22242122124222).

The spelling of 10021111012221 in words is "ten trillion, twenty-one billion, one hundred eleven million, twelve thousand, two hundred twenty-one".