11101021001221 has 8 divisors (see below), whose sum is σ = 11202940825560. Its totient is φ = 10999102551552.

The previous prime is 11101021001219. The next prime is 11101021001251. The reversal of 11101021001221 is 12210012010111.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8884005025 + 11092136996196 = 94255^2 + 3330486^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 11101021001221 - 2¹ = 11101021001219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11101021001201) 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, 23333901 + ... + 23804893.

It is an arithmetic number, because the mean of its divisors is an integer number (1400367603195).

Almost surely, 2^{11101021001221} is an apocalyptic number.

It is an amenable number.

11101021001221 is a deficient number, since it is larger than the sum of its proper divisors (101919824339).

11101021001221 is a wasteful number, since it uses less digits than its factorization.

11101021001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687335.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 11101021001221 its reverse (12210012010111), we get a palindrome (23311033011332).

The spelling of 11101021001221 in words is "eleven trillion, one hundred one billion, twenty-one million, one thousand, two hundred twenty-one".