11212110212121 has 72 divisors (see below), whose sum is σ = 20583841112640. Its totient is φ = 5754239906688.

The previous prime is 11212110212119. The next prime is 11212110212141. The reversal of 11212110212121 is 12121201121211.

It is a happy number.

11212110212121 is a `hidden beast` number, since 1 + 121 + 211 + 0 + 212 + 121 = 666.

It is not a de Polignac number, because 11212110212121 - 2¹ = 11212110212119 is a prime.

It is a super-2 number, since 2×11212110212121² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11212110212094 and 11212110212103.

It is not an unprimeable number, because it can be changed into a prime (11212110212141) 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 71 ways as a sum of consecutive naturals, for example, 13836831 + ... + 14624708.

It is an arithmetic number, because the mean of its divisors is an integer number (285886682120).

Almost surely, 2^{11212110212121} is an apocalyptic number.

It is an amenable number.

11212110212121 is a deficient number, since it is larger than the sum of its proper divisors (9371730900519).

11212110212121 is a wasteful number, since it uses less digits than its factorization.

11212110212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28461615 (or 28461599 counting only the distinct ones).

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

Adding to 11212110212121 its reverse (12121201121211), we get a palindrome (23333311333332).

The spelling of 11212110212121 in words is "eleven trillion, two hundred twelve billion, one hundred ten million, two hundred twelve thousand, one hundred twenty-one".