11100123121 has 2 divisors, whose sum is σ = 11100123122. Its totient is φ = 11100123120.

The previous prime is 11100123043. The next prime is 11100123131. The reversal of 11100123121 is 12132100111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5827184896 + 5272938225 = 76336^2 + 72615^2 .

It is a cyclic number.

It is not a de Polignac number, because 11100123121 - 2⁷ = 11100122993 is a prime.

It is not a weakly prime, because it can be changed into another prime (11100123131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5550061560 + 5550061561.

It is an arithmetic number, because the mean of its divisors is an integer number (5550061561).

Almost surely, 2^11100123121 is an apocalyptic number.

It is an amenable number.

11100123121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11100123121 is an equidigital number, since it uses as much as digits as its factorization.

11100123121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 11100123121 its reverse (12132100111), we get a palindrome (23232223232).

The spelling of 11100123121 in words is "eleven billion, one hundred million, one hundred twenty-three thousand, one hundred twenty-one".