11011220110021 has 8 divisors (see below), whose sum is σ = 11131202124504. Its totient is φ = 10891370019840.

The previous prime is 11011220109871. The next prime is 11011220110067. The reversal of 11011220110021 is 12001102211011.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 441659930625 + 10569560179396 = 664575^2 + 3251086^2 .

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 11011220110021 - 2¹¹ = 11011220107973 is a prime.

It is a super-2 number, since 2×11011220110021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11011220109983 and 11011220110010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11011220110091) 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, 32813230 + ... + 33147103.

It is an arithmetic number, because the mean of its divisors is an integer number (1391400265563).

Almost surely, 2^{11011220110021} is an apocalyptic number.

It is an amenable number.

11011220110021 is a deficient number, since it is larger than the sum of its proper divisors (119982014483).

11011220110021 is an equidigital number, since it uses as much as digits as its factorization.

11011220110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65962151.

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

Adding to 11011220110021 its reverse (12001102211011), we get a palindrome (23012322321032).

The spelling of 11011220110021 in words is "eleven trillion, eleven billion, two hundred twenty million, one hundred ten thousand, twenty-one".