11112201021221 has 4 divisors (see below), whose sum is σ = 11192144913600. Its totient is φ = 11032257128844.

The previous prime is 11112201021203. The next prime is 11112201021239. The reversal of 11112201021221 is 12212010221111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (11112201021203) and next prime (11112201021239).

It is a cyclic number.

It is not a de Polignac number, because 11112201021221 - 2¹⁴ = 11112201004837 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 11112201021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11112201026221) 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, 39971945981 + ... + 39971946258.

It is an arithmetic number, because the mean of its divisors is an integer number (2798036228400).

Almost surely, 2^{11112201021221} is an apocalyptic number.

It is an amenable number.

11112201021221 is a deficient number, since it is larger than the sum of its proper divisors (79943892379).

11112201021221 is an equidigital number, since it uses as much as digits as its factorization.

11112201021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79943892378.

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

Adding to 11112201021221 its reverse (12212010221111), we get a palindrome (23324211242332).

The spelling of 11112201021221 in words is "eleven trillion, one hundred twelve billion, two hundred one million, twenty-one thousand, two hundred twenty-one".