11211022012121 has 4 divisors (see below), whose sum is σ = 11211044966352. Its totient is φ = 11210999057892.

The previous prime is 11211022012079. The next prime is 11211022012159. The reversal of 11211022012121 is 12121022011211.

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-11211022012121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11211022012121.

It is not an unprimeable number, because it can be changed into a prime (11211022012171) 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, 10728215 + ... + 11726748.

It is an arithmetic number, because the mean of its divisors is an integer number (2802761241588).

Almost surely, 2^{11211022012121} is an apocalyptic number.

It is an amenable number.

11211022012121 is a deficient number, since it is larger than the sum of its proper divisors (22954231).

11211022012121 is an equidigital number, since it uses as much as digits as its factorization.

11211022012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22954230.

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

Adding to 11211022012121 its reverse (12121022011211), we get a palindrome (23332044023332).

The spelling of 11211022012121 in words is "eleven trillion, two hundred eleven billion, twenty-two million, twelve thousand, one hundred twenty-one".