161323421 has 8 divisors (see below), whose sum is σ = 195215040. Its totient is φ = 130143168.

The previous prime is 161323373. The next prime is 161323427. The reversal of 161323421 is 124323161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161323421 - 2²⁶ = 94214557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161323427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 677711 + ... + 677948.

It is an arithmetic number, because the mean of its divisors is an integer number (24401880).

Almost surely, 2^161323421 is an apocalyptic number.

It is an amenable number.

161323421 is a deficient number, since it is larger than the sum of its proper divisors (33891619).

161323421 is a wasteful number, since it uses less digits than its factorization.

161323421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1355683.

The product of its digits is 864, while the sum is 23.

The square root of 161323421 is about 12701.3157192474. The cubic root of 161323421 is about 544.3762141794.

Adding to 161323421 its reverse (124323161), we get a palindrome (285646582).

The spelling of 161323421 in words is "one hundred sixty-one million, three hundred twenty-three thousand, four hundred twenty-one".