11123123420 has 24 divisors (see below), whose sum is σ = 24164028000. Its totient is φ = 4295826752.

The previous prime is 11123123387. The next prime is 11123123467. The reversal of 11123123420 is 2432132111.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 11123123392 and 11123123401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9588320 + ... + 9589479.

It is an arithmetic number, because the mean of its divisors is an integer number (1006834500).

Almost surely, 2^11123123420 is an apocalyptic number.

11123123420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11123123420 is an abundant number, since it is smaller than the sum of its proper divisors (13040904580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11123123420 is a wasteful number, since it uses less digits than its factorization.

11123123420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19177837 (or 19177835 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 11123123420 its reverse (2432132111), we get a palindrome (13555255531).

The spelling of 11123123420 in words is "eleven billion, one hundred twenty-three million, one hundred twenty-three thousand, four hundred twenty".