11123101021 has 4 divisors (see below), whose sum is σ = 11181337344. Its totient is φ = 11064864700.

The previous prime is 11123101019. The next prime is 11123101039. The reversal of 11123101021 is 12010132111.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 11123101021 - 2¹ = 11123101019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11123100992 and 11123101010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11123101321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29117875 + ... + 29118256.

It is an arithmetic number, because the mean of its divisors is an integer number (2795334336).

Almost surely, 2^11123101021 is an apocalyptic number.

It is an amenable number.

11123101021 is a deficient number, since it is larger than the sum of its proper divisors (58236323).

11123101021 is an equidigital number, since it uses as much as digits as its factorization.

11123101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58236322.

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

Adding to 11123101021 its reverse (12010132111), we get a palindrome (23133233132).

The spelling of 11123101021 in words is "eleven billion, one hundred twenty-three million, one hundred one thousand, twenty-one".