161421043392 has 756 divisors, whose sum is σ = 575826428736. Its totient is φ = 43048212480.

The previous prime is 161421043369. The next prime is 161421043397. The reversal of 161421043392 is 293340124161.

161421043392 is a `hidden beast` number, since 1 + 6 + 1 + 4 + 210 + 433 + 9 + 2 = 666.

161421043392 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (161421043397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 2735949859 + ... + 2735949917.

Almost surely, 2^161421043392 is an apocalyptic number.

161421043392 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 161421043392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (287913214368).

161421043392 is an abundant number, since it is smaller than the sum of its proper divisors (414405385344).

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

161421043392 is a wasteful number, since it uses less digits than its factorization.

161421043392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The spelling of 161421043392 in words is "one hundred sixty-one billion, four hundred twenty-one million, forty-three thousand, three hundred ninety-two".