11210121111221 has 4 divisors (see below), whose sum is σ = 11211604135200. Its totient is φ = 11208638087244.

The previous prime is 11210121111097. The next prime is 11210121111227. The reversal of 11210121111221 is 12211112101211.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11210121111221 is a prime.

It is a super-2 number, since 2×11210121111221² (a number of 27 digits) contains 22 as substring.

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 11210121111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11210121111227) 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, 741500651 + ... + 741515768.

It is an arithmetic number, because the mean of its divisors is an integer number (2802901033800).

Almost surely, 2^{11210121111221} is an apocalyptic number.

It is an amenable number.

11210121111221 is a deficient number, since it is larger than the sum of its proper divisors (1483023979).

11210121111221 is an equidigital number, since it uses as much as digits as its factorization.

11210121111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1483023978.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 11210121111221 its reverse (12211112101211), we get a palindrome (23421233212432).

The spelling of 11210121111221 in words is "eleven trillion, two hundred ten billion, one hundred twenty-one million, one hundred eleven thousand, two hundred twenty-one".