11211001120021 has 4 divisors (see below), whose sum is σ = 11218560798592. Its totient is φ = 11203441441452.

The previous prime is 11211001120009. The next prime is 11211001120043. The reversal of 11211001120021 is 12002110011211.

It is a happy number.

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 11211001120021 - 2²⁷ = 11210866902293 is a prime.

It is a super-2 number, since 2×11211001120021² (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 = 11211001119983 and 11211001120010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211001120321) 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, 3779837061 + ... + 3779840026.

It is an arithmetic number, because the mean of its divisors is an integer number (2804640199648).

Almost surely, 2^{11211001120021} is an apocalyptic number.

It is an amenable number.

11211001120021 is a deficient number, since it is larger than the sum of its proper divisors (7559678571).

11211001120021 is an equidigital number, since it uses as much as digits as its factorization.

11211001120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7559678570.

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

Adding to 11211001120021 its reverse (12002110011211), we get a palindrome (23213111131232).

The spelling of 11211001120021 in words is "eleven trillion, two hundred eleven billion, one million, one hundred twenty thousand, twenty-one".