32821421 has 4 divisors (see below), whose sum is σ = 32833500. Its totient is φ = 32809344.

The previous prime is 32821409. The next prime is 32821423. The reversal of 32821421 is 12412823.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 16933225 + 15888196 = 4115^2 + 3986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-32821421 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 (32821423) 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, 155 + ... + 8103.

It is an arithmetic number, because the mean of its divisors is an integer number (8208375).

Almost surely, 2^32821421 is an apocalyptic number.

It is an amenable number.

32821421 is a deficient number, since it is larger than the sum of its proper divisors (12079).

32821421 is an equidigital number, since it uses as much as digits as its factorization.

32821421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12078.

The product of its digits is 768, while the sum is 23.

The square root of 32821421 is about 5728.9982544944. The cubic root of 32821421 is about 320.1738020699.

The spelling of 32821421 in words is "thirty-two million, eight hundred twenty-one thousand, four hundred twenty-one".