11212011101221 has 4 divisors (see below), whose sum is σ = 12813726972832. Its totient is φ = 9610295229612.

The previous prime is 11212011101219. The next prime is 11212011101279. The reversal of 11212011101221 is 12210111021211.

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 not a de Polignac number, because 11212011101221 - 2¹ = 11212011101219 is a prime.

It is a super-2 number, since 2×11212011101221² (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 = 11212011101195 and 11212011101204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11212011101521) 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 3 ways as a sum of consecutive naturals, for example, 800857935795 + ... + 800857935808.

It is an arithmetic number, because the mean of its divisors is an integer number (3203431743208).

Almost surely, 2^{11212011101221} is an apocalyptic number.

It is an amenable number.

11212011101221 is a deficient number, since it is larger than the sum of its proper divisors (1601715871611).

11212011101221 is an equidigital number, since it uses as much as digits as its factorization.

11212011101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1601715871610.

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

Adding to 11212011101221 its reverse (12210111021211), we get a palindrome (23422122122432).

The spelling of 11212011101221 in words is "eleven trillion, two hundred twelve billion, eleven million, one hundred one thousand, two hundred twenty-one".