11122121121021 has 6 divisors (see below), whose sum is σ = 16065286063710. Its totient is φ = 7414747414008.

The previous prime is 11122121120939. The next prime is 11122121121047. The reversal of 11122121121021 is 12012112122111.

It is a happy number.

11122121121021 is a `hidden beast` number, since 1 + 1 + 1 + 221 + 211 + 210 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11118790215225 + 3330905796 = 3334485^2 + 57714^2 .

It is not a de Polignac number, because 11122121121021 - 2⁷ = 11122121120893 is a prime.

It is a super-2 number, since 2×11122121121021² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11122121120985 and 11122121121003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11122121125021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 617895617826 + ... + 617895617843.

It is an arithmetic number, because the mean of its divisors is an integer number (2677547677285).

Almost surely, 2^{11122121121021} is an apocalyptic number.

It is an amenable number.

11122121121021 is a deficient number, since it is larger than the sum of its proper divisors (4943164942689).

11122121121021 is a wasteful number, since it uses less digits than its factorization.

11122121121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1235791235675 (or 1235791235672 counting only the distinct ones).

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

Adding to 11122121121021 its reverse (12012112122111), we get a palindrome (23134233243132).

The spelling of 11122121121021 in words is "eleven trillion, one hundred twenty-two billion, one hundred twenty-one million, one hundred twenty-one thousand, twenty-one".