34520821 has 2 divisors, whose sum is σ = 34520822. Its totient is φ = 34520820.

The previous prime is 34520819. The next prime is 34520833. The reversal of 34520821 is 12802543.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31798321 + 2722500 = 5639^2 + 1650^2 .

It is a cyclic number.

It is not a de Polignac number, because 34520821 - 2¹ = 34520819 is a prime.

Together with 34520819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (34520881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17260410 + 17260411.

It is an arithmetic number, because the mean of its divisors is an integer number (17260411).

Almost surely, 2^34520821 is an apocalyptic number.

It is an amenable number.

34520821 is a deficient number, since it is larger than the sum of its proper divisors (1).

34520821 is an equidigital number, since it uses as much as digits as its factorization.

34520821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 34520821 is about 5875.4421961245. The cubic root of 34520821 is about 325.6069792919.

The spelling of 34520821 in words is "thirty-four million, five hundred twenty thousand, eight hundred twenty-one".