1001111202221 has 24 divisors (see below), whose sum is σ = 1099281317400. Its totient is φ = 906270678144.

The previous prime is 1001111202211. The next prime is 1001111202229. The reversal of 1001111202221 is 1222021111001.

1001111202221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 9503520196 + 991607682025 = 97486^2 + 995795^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1001111202221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001111202196 and 1001111202205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001111202229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12047411 + ... + 12130223.

It is an arithmetic number, because the mean of its divisors is an integer number (45803388225).

Almost surely, 2^{1001111202221} is an apocalyptic number.

It is an amenable number.

1001111202221 is a deficient number, since it is larger than the sum of its proper divisors (98170115179).

1001111202221 is an equidigital number, since it uses as much as digits as its factorization.

1001111202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83133 (or 83054 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1001111202221 its reverse (1222021111001), we get a palindrome (2223132313222).

The spelling of 1001111202221 in words is "one trillion, one billion, one hundred eleven million, two hundred two thousand, two hundred twenty-one".