11001020221221 has 4 divisors (see below), whose sum is σ = 14668026961632. Its totient is φ = 7334013480812.

The previous prime is 11001020221183. The next prime is 11001020221223. The reversal of 11001020221221 is 12212202010011.

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 not a de Polignac number, because 11001020221221 - 2³⁰ = 10999946479397 is a prime.

It is a super-3 number, since 3×11001020221221³ (a number of 40 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11001020221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11001020221223) 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, 1833503370201 + ... + 1833503370206.

It is an arithmetic number, because the mean of its divisors is an integer number (3667006740408).

Almost surely, 2^{11001020221221} is an apocalyptic number.

It is an amenable number.

11001020221221 is a deficient number, since it is larger than the sum of its proper divisors (3667006740411).

11001020221221 is an equidigital number, since it uses as much as digits as its factorization.

11001020221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3667006740410.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 11001020221221 its reverse (12212202010011), we get a palindrome (23213222231232).

The spelling of 11001020221221 in words is "eleven trillion, one billion, twenty million, two hundred twenty-one thousand, two hundred twenty-one".