34331821 has 4 divisors (see below), whose sum is σ = 34344700. Its totient is φ = 34318944.

The previous prime is 34331779. The next prime is 34331861. The reversal of 34331821 is 12813343.

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 15721225 + 18610596 = 3965^2 + 4314^2 .

It is a cyclic number.

It is not a de Polignac number, because 34331821 - 2²³ = 25943213 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 (34331861) 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, 786 + ... + 8323.

It is an arithmetic number, because the mean of its divisors is an integer number (8586175).

Almost surely, 2^34331821 is an apocalyptic number.

It is an amenable number.

34331821 is a deficient number, since it is larger than the sum of its proper divisors (12879).

34331821 is an equidigital number, since it uses as much as digits as its factorization.

34331821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12878.

The product of its digits is 1728, while the sum is 25.

The square root of 34331821 is about 5859.3362252050. The cubic root of 34331821 is about 325.0116634867.

The spelling of 34331821 in words is "thirty-four million, three hundred thirty-one thousand, eight hundred twenty-one".