1231421842872 has 192 divisors, whose sum is σ = 3731062608000. Its totient is φ = 364300941312.

The previous prime is 1231421842867. The next prime is 1231421842907. The reversal of 1231421842872 is 2782481241321.

1231421842872 is a `hidden beast` number, since 1 + 2 + 3 + 1 + 4 + 218 + 428 + 7 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6392508 + ... + 6582324.

It is an arithmetic number, because the mean of its divisors is an integer number (19432617750).

Almost surely, 2^{1231421842872} is an apocalyptic number.

1231421842872 is a gapful number since it is divisible by the number (12) 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 1231421842872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1865531304000).

1231421842872 is an abundant number, since it is smaller than the sum of its proper divisors (2499640765128).

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

1231421842872 is a wasteful number, since it uses less digits than its factorization.

1231421842872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190110 (or 190103 counting only the distinct ones).

The product of its digits is 344064, while the sum is 45.

The spelling of 1231421842872 in words is "one trillion, two hundred thirty-one billion, four hundred twenty-one million, eight hundred forty-two thousand, eight hundred seventy-two".