11221211202021 has 48 divisors (see below), whose sum is σ = 17238834989376. Its totient is φ = 7023697567488.

The previous prime is 11221211202013. The next prime is 11221211202037. The reversal of 11221211202021 is 12020211212211.

11221211202021 is a `hidden beast` number, since 11 + 221 + 211 + 20 + 202 + 1 = 666.

It is not a de Polignac number, because 11221211202021 - 2³ = 11221211202013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11221211201985 and 11221211202003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221211202011) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3532360 + ... + 5909313.

It is an arithmetic number, because the mean of its divisors is an integer number (359142395612).

Almost surely, 2^{11221211202021} is an apocalyptic number.

It is an amenable number.

11221211202021 is a deficient number, since it is larger than the sum of its proper divisors (6017623787355).

11221211202021 is a wasteful number, since it uses less digits than its factorization.

11221211202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9441842 (or 9441839 counting only the distinct ones).

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

Adding to 11221211202021 its reverse (12020211212211), we get a palindrome (23241422414232).

The spelling of 11221211202021 in words is "eleven trillion, two hundred twenty-one billion, two hundred eleven million, two hundred two thousand, twenty-one".