11211122220021 has 24 divisors (see below), whose sum is σ = 16394812281120. Its totient is φ = 7381390946976.

The previous prime is 11211122220017. The next prime is 11211122220059. The reversal of 11211122220021 is 12002222111211.

11211122220021 is a `hidden beast` number, since 11 + 211 + 1 + 222 + 200 + 21 = 666.

It is not a de Polignac number, because 11211122220021 - 2² = 11211122220017 is a prime.

It is a super-3 number, since 3×11211122220021³ (a number of 40 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 11211122219976 and 11211122220003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211122220721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 593551 + ... + 4772268.

It is an arithmetic number, because the mean of its divisors is an integer number (683117178380).

Almost surely, 2^{11211122220021} is an apocalyptic number.

It is an amenable number.

11211122220021 is a deficient number, since it is larger than the sum of its proper divisors (5183690061099).

11211122220021 is a wasteful number, since it uses less digits than its factorization.

11211122220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5368705 (or 5368702 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 11211122220021 its reverse (12002222111211), we get a palindrome (23213344331232).

The spelling of 11211122220021 in words is "eleven trillion, two hundred eleven billion, one hundred twenty-two million, two hundred twenty thousand, twenty-one".