34020421 has 2 divisors, whose sum is σ = 34020422. Its totient is φ = 34020420.

The previous prime is 34020419. The next prime is 34020457. The reversal of 34020421 is 12402043.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25897921 + 8122500 = 5089^2 + 2850^2 .

It is a cyclic number.

It is not a de Polignac number, because 34020421 - 2¹ = 34020419 is a prime.

Together with 34020419, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 34020395 and 34020404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (34020491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17010210 + 17010211.

It is an arithmetic number, because the mean of its divisors is an integer number (17010211).

Almost surely, 2^34020421 is an apocalyptic number.

It is an amenable number.

34020421 is a deficient number, since it is larger than the sum of its proper divisors (1).

34020421 is an equidigital number, since it uses as much as digits as its factorization.

34020421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 34020421 is about 5832.7027182945. The cubic root of 34020421 is about 324.0260260809.

Adding to 34020421 its reverse (12402043), we get a palindrome (46422464).

It can be divided in two parts, 3402042 and 1, that added together give a palindrome (3402043).

The spelling of 34020421 in words is "thirty-four million, twenty thousand, four hundred twenty-one".