123181321284 has 432 divisors, whose sum is σ = 388825819200. Its totient is φ = 32690552832.

The previous prime is 123181321259. The next prime is 123181321321. The reversal of 123181321284 is 482123181321.

123181321284 is a `hidden beast` number, since 1 + 231 + 81 + 321 + 28 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

Its product of digits (18432) is a multiple of the sum of its prime factors (512).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 638245092 + ... + 638245284.

Almost surely, 2^123181321284 is an apocalyptic number.

123181321284 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123181321284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194412909600).

123181321284 is an abundant number, since it is smaller than the sum of its proper divisors (265644497916).

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

123181321284 is a wasteful number, since it uses less digits than its factorization.

123181321284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512 (or 500 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The spelling of 123181321284 in words is "one hundred twenty-three billion, one hundred eighty-one million, three hundred twenty-one thousand, two hundred eighty-four".