11211022221021 has 40 divisors (see below), whose sum is σ = 19140762791040. Its totient is φ = 6405977873952.

The previous prime is 11211022221019. The next prime is 11211022221023. The reversal of 11211022221021 is 12012222011211.

11211022221021 is a `hidden beast` number, since 1 + 1 + 211 + 0 + 222 + 210 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (11211022221019) and next prime (11211022221023).

It is not a de Polignac number, because 11211022221021 - 2¹ = 11211022221019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11211022220985 and 11211022221003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211022221023) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 11086315 + ... + 12055223.

It is an arithmetic number, because the mean of its divisors is an integer number (478519069776).

Almost surely, 2^{11211022221021} is an apocalyptic number.

It is an amenable number.

11211022221021 is a deficient number, since it is larger than the sum of its proper divisors (7929740570019).

11211022221021 is an equidigital number, since it uses as much as digits as its factorization.

11211022221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989335 (or 989326 counting only the distinct ones).

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

Adding to 11211022221021 its reverse (12012222011211), we get a palindrome (23223244232232).

The spelling of 11211022221021 in words is "eleven trillion, two hundred eleven billion, twenty-two million, two hundred twenty-one thousand, twenty-one".