11011122001221 has 8 divisors (see below), whose sum is σ = 14681653815264. Its totient is φ = 7340669094000.

The previous prime is 11011122001171. The next prime is 11011122001259. The reversal of 11011122001221 is 12210022111011.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11011122001221 - 2¹⁸ = 11011121739077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11011122001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11011122001421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19400326 + ... + 19959831.

It is an arithmetic number, because the mean of its divisors is an integer number (1835206726908).

Almost surely, 2^{11011122001221} is an apocalyptic number.

It is an amenable number.

11011122001221 is a deficient number, since it is larger than the sum of its proper divisors (3670531814043).

11011122001221 is an equidigital number, since it uses as much as digits as its factorization.

11011122001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39453411.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 11011122001221 its reverse (12210022111011), we get a palindrome (23221144112232).

The spelling of 11011122001221 in words is "eleven trillion, eleven billion, one hundred twenty-two million, one thousand, two hundred twenty-one".