34213721 has 8 divisors (see below), whose sum is σ = 35152488. Its totient is φ = 33280000.

The previous prime is 34213709. The next prime is 34213723. The reversal of 34213721 is 12731243.

It can be written as a sum of positive squares in 4 ways, for example, as 4999696 + 29214025 = 2236^2 + 5405^2 .

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 34213721 - 2¹⁰ = 34212697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (34213723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15401 + ... + 17481.

It is an arithmetic number, because the mean of its divisors is an integer number (4394061).

Almost surely, 2^34213721 is an apocalyptic number.

It is an amenable number.

34213721 is a deficient number, since it is larger than the sum of its proper divisors (938767).

34213721 is a wasteful number, since it uses less digits than its factorization.

34213721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2523.

The product of its digits is 1008, while the sum is 23.

The square root of 34213721 is about 5849.2496099927. The cubic root of 34213721 is about 324.6385599188.

Adding to 34213721 its reverse (12731243), we get a palindrome (46944964).

The spelling of 34213721 in words is "thirty-four million, two hundred thirteen thousand, seven hundred twenty-one".