12123223440 has 40 divisors (see below), whose sum is σ = 37581993408. Its totient is φ = 3232859520.

The previous prime is 12123223421. The next prime is 12123223459. The reversal of 12123223440 is 4432232121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12123223421) and next prime (12123223459).

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 12123223440.

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, 25256476 + ... + 25256955.

Almost surely, 2^12123223440 is an apocalyptic number.

12123223440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12123223440 is an abundant number, since it is smaller than the sum of its proper divisors (25458769968).

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

12123223440 is a wasteful number, since it uses less digits than its factorization.

12123223440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50513447 (or 50513441 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 12123223440 its reverse (4432232121), we get a palindrome (16555455561).

The spelling of 12123223440 in words is "twelve billion, one hundred twenty-three million, two hundred twenty-three thousand, four hundred forty".