32121421 has 4 divisors (see below), whose sum is σ = 32159932. Its totient is φ = 32082912.

The previous prime is 32121413. The next prime is 32121433. The reversal of 32121421 is 12412123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12412123 = 53 ⋅234191.

It can be written as a sum of positive squares in 2 ways, for example, as 12638025 + 19483396 = 3555^2 + 4414^2 .

It is a cyclic number.

It is not a de Polignac number, because 32121421 - 2³ = 32121413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 32121395 and 32121404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32121451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17976 + ... + 19681.

It is an arithmetic number, because the mean of its divisors is an integer number (8039983).

Almost surely, 2^32121421 is an apocalyptic number.

It is an amenable number.

32121421 is a deficient number, since it is larger than the sum of its proper divisors (38511).

32121421 is an equidigital number, since it uses as much as digits as its factorization.

32121421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38510.

The product of its digits is 96, while the sum is 16.

The square root of 32121421 is about 5667.5762897380. The cubic root of 32121421 is about 317.8812532123.

Adding to 32121421 its reverse (12412123), we get a palindrome (44533544).

The spelling of 32121421 in words is "thirty-two million, one hundred twenty-one thousand, four hundred twenty-one".