11212211021021 has 4 divisors (see below), whose sum is σ = 11236532520444. Its totient is φ = 11187889521600.

The previous prime is 11212211020981. The next prime is 11212211021029. The reversal of 11212211021021 is 12012011221211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2384692620025 + 8827518400996 = 1544245^2 + 2971114^2 .

It is a cyclic number.

It is not a de Polignac number, because 11212211021021 - 2²⁶ = 11212143912157 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 (11212211021029) 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, 12160749020 + ... + 12160749941.

It is an arithmetic number, because the mean of its divisors is an integer number (2809133130111).

Almost surely, 2^{11212211021021} is an apocalyptic number.

It is an amenable number.

11212211021021 is a deficient number, since it is larger than the sum of its proper divisors (24321499423).

11212211021021 is an equidigital number, since it uses as much as digits as its factorization.

11212211021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24321499422.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 11212211021021 its reverse (12012011221211), we get a palindrome (23224222242232).

The spelling of 11212211021021 in words is "eleven trillion, two hundred twelve billion, two hundred eleven million, twenty-one thousand, twenty-one".