161421811430 has 16 divisors (see below), whose sum is σ = 316973739024. Its totient is φ = 58698840480.

The previous prime is 161421811429. The next prime is 161421811433. The reversal of 161421811430 is 34118124161.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161421811433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 733735397 + ... + 733735616.

It is an arithmetic number, because the mean of its divisors is an integer number (19810858689).

Almost surely, 2^161421811430 is an apocalyptic number.

161421811430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161421811430 is a deficient number, since it is larger than the sum of its proper divisors (155551927594).

161421811430 is a wasteful number, since it uses less digits than its factorization.

161421811430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1467471031.

The product of its (nonzero) digits is 4608, while the sum is 32.

Adding to 161421811430 its reverse (34118124161), we get a palindrome (195539935591).

The spelling of 161421811430 in words is "one hundred sixty-one billion, four hundred twenty-one million, eight hundred eleven thousand, four hundred thirty".