161030421 has 12 divisors (see below), whose sum is σ = 232710348. Its totient is φ = 107302464.

The previous prime is 161030357. The next prime is 161030447. The reversal of 161030421 is 124030161.

It is a happy number.

161030421 is a `hidden beast` number, since 1 + 610 + 30 + 4 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 115992900 + 45037521 = 10770^2 + 6711^2 .

It is not a de Polignac number, because 161030421 - 2⁶ = 161030357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161030394 and 161030403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161030021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31201 + ... + 35993.

It is an arithmetic number, because the mean of its divisors is an integer number (19392529).

Almost surely, 2^161030421 is an apocalyptic number.

It is an amenable number.

161030421 is a deficient number, since it is larger than the sum of its proper divisors (71679927).

161030421 is a wasteful number, since it uses less digits than its factorization.

161030421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8532 (or 8529 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 161030421 is about 12689.7762391620. The cubic root of 161030421 is about 544.0464441406.

Adding to 161030421 its reverse (124030161), we get a palindrome (285060582).

The spelling of 161030421 in words is "one hundred sixty-one million, thirty thousand, four hundred twenty-one".