123111204240 has 40 divisors (see below), whose sum is σ = 381644733888. Its totient is φ = 32829654400.

The previous prime is 123111204217. The next prime is 123111204277. The reversal of 123111204240 is 42402111321.

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

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, 256481436 + ... + 256481915.

Almost surely, 2^123111204240 is an apocalyptic number.

123111204240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123111204240 is an abundant number, since it is smaller than the sum of its proper divisors (258533529648).

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

123111204240 is a wasteful number, since it uses less digits than its factorization.

123111204240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512963367 (or 512963361 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 123111204240 its reverse (42402111321), we get a palindrome (165513315561).

The spelling of 123111204240 in words is "one hundred twenty-three billion, one hundred eleven million, two hundred four thousand, two hundred forty".