11211102212121 has 144 divisors (see below), whose sum is σ = 20265868172160. Its totient is φ = 5932945751040.

The previous prime is 11211102212113. The next prime is 11211102212147. The reversal of 11211102212121 is 12121220111211.

It is a happy number.

11211102212121 is a `hidden beast` number, since 1 + 121 + 110 + 221 + 212 + 1 = 666.

It is not a de Polignac number, because 11211102212121 - 2³ = 11211102212113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11211102212094 and 11211102212103.

It is not an unprimeable number, because it can be changed into a prime (11211102212221) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 472651500 + ... + 472675218.

It is an arithmetic number, because the mean of its divisors is an integer number (140735195640).

Almost surely, 2^{11211102212121} is an apocalyptic number.

It is an amenable number.

11211102212121 is a deficient number, since it is larger than the sum of its proper divisors (9054765960039).

11211102212121 is a wasteful number, since it uses less digits than its factorization.

11211102212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24764 (or 24754 counting only the distinct ones).

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

Adding to 11211102212121 its reverse (12121220111211), we get a palindrome (23332322323332).

The spelling of 11211102212121 in words is "eleven trillion, two hundred eleven billion, one hundred two million, two hundred twelve thousand, one hundred twenty-one".