10111200121 has 4 divisors (see below), whose sum is σ = 11030400144. Its totient is φ = 9192000100.

The previous prime is 10111200101. The next prime is 10111200139. The reversal of 10111200121 is 12100211101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12100211101 = 11 ⋅1100019191.

It is a cyclic number.

It is not a de Polignac number, because 10111200121 - 2⁵ = 10111200089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10111200098 and 10111200107.

It is not an unprimeable number, because it can be changed into a prime (10111200101) 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 3 ways as a sum of consecutive naturals, for example, 459599995 + ... + 459600016.

It is an arithmetic number, because the mean of its divisors is an integer number (2757600036).

Almost surely, 2^10111200121 is an apocalyptic number.

10111200121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10111200121 is a deficient number, since it is larger than the sum of its proper divisors (919200023).

10111200121 is an equidigital number, since it uses as much as digits as its factorization.

10111200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 919200022.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 10111200121 its reverse (12100211101), we get a palindrome (22211411222).

The spelling of 10111200121 in words is "ten billion, one hundred eleven million, two hundred thousand, one hundred twenty-one".