161254311421 has 8 divisors (see below), whose sum is σ = 189271470080. Its totient is φ = 134482359888.

The previous prime is 161254311419. The next prime is 161254311433. The reversal of 161254311421 is 124113452161.

161254311421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 161254311421 - 2¹ = 161254311419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161254311401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 311301501 + ... + 311302018.

It is an arithmetic number, because the mean of its divisors is an integer number (23658933760).

Almost surely, 2^161254311421 is an apocalyptic number.

It is an amenable number.

161254311421 is a deficient number, since it is larger than the sum of its proper divisors (28017158659).

161254311421 is an equidigital number, since it uses as much as digits as its factorization.

161254311421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622603563.

The product of its digits is 5760, while the sum is 31.

Adding to 161254311421 its reverse (124113452161), we get a palindrome (285367763582).

The spelling of 161254311421 in words is "one hundred sixty-one billion, two hundred fifty-four million, three hundred eleven thousand, four hundred twenty-one".