32161425421 has 4 divisors (see below), whose sum is σ = 32162060700. Its totient is φ = 32160790144.

The previous prime is 32161425407. The next prime is 32161425487. The reversal of 32161425421 is 12452416123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12452416123 = 7 ⋅1778916589.

It can be written as a sum of positive squares in 2 ways, for example, as 14771728521 + 17389696900 = 121539^2 + 131870^2 .

It is a cyclic number.

It is not a de Polignac number, because 32161425421 - 2¹¹ = 32161423373 is a prime.

It is a super-2 number, since 2×32161425421² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32161425721) 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 3 ways as a sum of consecutive naturals, for example, 234436 + ... + 345373.

It is an arithmetic number, because the mean of its divisors is an integer number (8040515175).

Almost surely, 2^32161425421 is an apocalyptic number.

It is an amenable number.

32161425421 is a deficient number, since it is larger than the sum of its proper divisors (635279).

32161425421 is an equidigital number, since it uses as much as digits as its factorization.

32161425421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635278.

The product of its digits is 11520, while the sum is 31.

The spelling of 32161425421 in words is "thirty-two billion, one hundred sixty-one million, four hundred twenty-five thousand, four hundred twenty-one".