11221221021021 has 48 divisors (see below), whose sum is σ = 18451645610112. Its totient is φ = 6504723456000.

The previous prime is 11221221021011. The next prime is 11221221021077. The reversal of 11221221021021 is 12012012212211.

11221221021021 is a `hidden beast` number, since 1 + 1 + 221 + 2 + 210 + 210 + 21 = 666.

It is not a de Polignac number, because 11221221021021 - 2¹⁰ = 11221221019997 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11221221020985 and 11221221021003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221221021011) 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, 48614941 + ... + 48845213.

It is an arithmetic number, because the mean of its divisors is an integer number (384409283544).

Almost surely, 2^{11221221021021} is an apocalyptic number.

11221221021021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11221221021021 is a deficient number, since it is larger than the sum of its proper divisors (7230424589091).

11221221021021 is a wasteful number, since it uses less digits than its factorization.

11221221021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251714 (or 251711 counting only the distinct ones).

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

Adding to 11221221021021 its reverse (12012012212211), we get a palindrome (23233233233232).

The spelling of 11221221021021 in words is "eleven trillion, two hundred twenty-one billion, two hundred twenty-one million, twenty-one thousand, twenty-one".