67250021 has 2 divisors, whose sum is σ = 67250022. Its totient is φ = 67250020.

The previous prime is 67249981. The next prime is 67250033. The reversal of 67250021 is 12005276.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54390625 + 12859396 = 7375^2 + 3586^2 .

It is a cyclic number.

It is not a de Polignac number, because 67250021 - 2⁶ = 67249957 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67250041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33625010 + 33625011.

It is an arithmetic number, because the mean of its divisors is an integer number (33625011).

Almost surely, 2^67250021 is an apocalyptic number.

It is an amenable number.

67250021 is a deficient number, since it is larger than the sum of its proper divisors (1).

67250021 is an equidigital number, since it uses as much as digits as its factorization.

67250021 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 67250021 is about 8200.6110138209. The cubic root of 67250021 is about 406.6593930289.

Adding to 67250021 its reverse (12005276), we get a palindrome (79255297).

The spelling of 67250021 in words is "sixty-seven million, two hundred fifty thousand, twenty-one".