34645021 has 2 divisors, whose sum is σ = 34645022. Its totient is φ = 34645020.

The previous prime is 34645019. The next prime is 34645027. The reversal of 34645021 is 12054643.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34644996 + 25 = 5886^2 + 5^2 .

It is an emirp because it is prime and its reverse (12054643) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 34645021 - 2¹ = 34645019 is a prime.

Together with 34645019, 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 (34645027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17322510 + 17322511.

It is an arithmetic number, because the mean of its divisors is an integer number (17322511).

Almost surely, 2^34645021 is an apocalyptic number.

It is an amenable number.

34645021 is a deficient number, since it is larger than the sum of its proper divisors (1).

34645021 is an equidigital number, since it uses as much as digits as its factorization.

34645021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 34645021 is about 5886.0021236829. The cubic root of 34645021 is about 325.9970046270.

Subtracting from 34645021 its sum of digits (25), we obtain a square (34644996 = 5886²).

Adding to 34645021 its reverse (12054643), we get a palindrome (46699664).

The spelling of 34645021 in words is "thirty-four million, six hundred forty-five thousand, twenty-one".