11100212121 has 16 divisors (see below), whose sum is σ = 15571035648. Its totient is φ = 7024521600.

The previous prime is 11100212087. The next prime is 11100212141. The reversal of 11100212121 is 12121200111.

It is not a de Polignac number, because 11100212121 - 2⁹ = 11100211609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11100212097 and 11100212106.

It is not an unprimeable number, because it can be changed into a prime (11100212141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1214985 + ... + 1224086.

It is an arithmetic number, because the mean of its divisors is an integer number (973189728).

Almost surely, 2^11100212121 is an apocalyptic number.

It is an amenable number.

11100212121 is a deficient number, since it is larger than the sum of its proper divisors (4470823527).

11100212121 is a wasteful number, since it uses less digits than its factorization.

11100212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2439152.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 11100212121 its reverse (12121200111), we get a palindrome (23221412232).

The spelling of 11100212121 in words is "eleven billion, one hundred million, two hundred twelve thousand, one hundred twenty-one".