11211022220021 has 8 divisors (see below), whose sum is σ = 12073508486424. Its totient is φ = 10348550231040.

The previous prime is 11211022219993. The next prime is 11211022220023. The reversal of 11211022220021 is 12002222011211.

It can be written as a sum of positive squares in 4 ways, for example, as 720639699025 + 10490382520996 = 848905^2 + 3238886^2 .

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 11211022220021 - 2¹⁴ = 11211022203637 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 (11211022220023) 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, 1909916 + ... + 5105861.

It is an arithmetic number, because the mean of its divisors is an integer number (1509188560803).

Almost surely, 2^{11211022220021} is an apocalyptic number.

It is an amenable number.

11211022220021 is a deficient number, since it is larger than the sum of its proper divisors (862486266403).

11211022220021 is a wasteful number, since it uses less digits than its factorization.

11211022220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7138711.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 11211022220021 its reverse (12002222011211), we get a palindrome (23213244231232).

The spelling of 11211022220021 in words is "eleven trillion, two hundred eleven billion, twenty-two million, two hundred twenty thousand, twenty-one".