11221211210121 has 24 divisors (see below), whose sum is σ = 17702637790656. Its totient is φ = 6792761291040.

The previous prime is 11221211210093. The next prime is 11221211210147. The reversal of 11221211210121 is 12101211212211.

It is a happy number.

11221211210121 is a `hidden beast` number, since 1 + 1 + 221 + 211 + 210 + 1 + 21 = 666.

It is not a de Polignac number, because 11221211210121 - 2⁵ = 11221211210089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11221211210094 and 11221211210103.

It is not an unprimeable number, because it can be changed into a prime (11221211218121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66354925 + ... + 66523818.

It is an arithmetic number, because the mean of its divisors is an integer number (737609907944).

Almost surely, 2^{11221211210121} is an apocalyptic number.

11221211210121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11221211210121 is a deficient number, since it is larger than the sum of its proper divisors (6481426580535).

11221211210121 is a wasteful number, since it uses less digits than its factorization.

11221211210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132879613 (or 132879610 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 11221211210121 its reverse (12101211212211), we get a palindrome (23322422422332).

The spelling of 11221211210121 in words is "eleven trillion, two hundred twenty-one billion, two hundred eleven million, two hundred ten thousand, one hundred twenty-one".