11011202121221 has 4 divisors (see below), whose sum is σ = 11011261277472. Its totient is φ = 11011142964972.

The previous prime is 11011202121197. The next prime is 11011202121301. The reversal of 11011202121221 is 12212120211011.

11011202121221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-11011202121221 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 11011202121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11011202151221) 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, 29298035 + ... + 29671488.

It is an arithmetic number, because the mean of its divisors is an integer number (2752815319368).

Almost surely, 2^{11011202121221} is an apocalyptic number.

It is an amenable number.

11011202121221 is a deficient number, since it is larger than the sum of its proper divisors (59156251).

11011202121221 is an equidigital number, since it uses as much as digits as its factorization.

11011202121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59156250.

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

Adding to 11011202121221 its reverse (12212120211011), we get a palindrome (23223322332232).

The spelling of 11011202121221 in words is "eleven trillion, eleven billion, two hundred two million, one hundred twenty-one thousand, two hundred twenty-one".