67052021 has 2 divisors, whose sum is σ = 67052022. Its totient is φ = 67052020.

The previous prime is 67051991. The next prime is 67052023. The reversal of 67052021 is 12025076.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50608996 + 16443025 = 7114^2 + 4055^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67052021 is a prime.

Together with 67052023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67052023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33526010 + 33526011.

It is an arithmetic number, because the mean of its divisors is an integer number (33526011).

Almost surely, 2^67052021 is an apocalyptic number.

It is an amenable number.

67052021 is a deficient number, since it is larger than the sum of its proper divisors (1).

67052021 is an equidigital number, since it uses as much as digits as its factorization.

67052021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 67052021 is about 8188.5298436288. The cubic root of 67052021 is about 406.2599001611.

Adding to 67052021 its reverse (12025076), we get a palindrome (79077097).

The spelling of 67052021 in words is "sixty-seven million, fifty-two thousand, twenty-one".