11100001212221 has 4 divisors (see below), whose sum is σ = 11101146851100. Its totient is φ = 11098855573344.

The previous prime is 11100001212193. The next prime is 11100001212229. The reversal of 11100001212221 is 12221210000111.

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 2164176400996 + 8935824811225 = 1471114^2 + 2989285^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11100001212221 is a prime.

It is a super-2 number, since 2×11100001212221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11100001212196 and 11100001212205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11100001212229) 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, 572804906 + ... + 572824283.

It is an arithmetic number, because the mean of its divisors is an integer number (2775286712775).

Almost surely, 2^{11100001212221} is an apocalyptic number.

It is an amenable number.

11100001212221 is a deficient number, since it is larger than the sum of its proper divisors (1145638879).

11100001212221 is an equidigital number, since it uses as much as digits as its factorization.

11100001212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1145638878.

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

Adding to 11100001212221 its reverse (12221210000111), we get a palindrome (23321211212332).

The spelling of 11100001212221 in words is "eleven trillion, one hundred billion, one million, two hundred twelve thousand, two hundred twenty-one".