67696021 has 2 divisors, whose sum is σ = 67696022. Its totient is φ = 67696020.

The previous prime is 67696003. The next prime is 67696037. The reversal of 67696021 is 12069676.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59367025 + 8328996 = 7705^2 + 2886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67696021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67696001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33848010 + 33848011.

It is an arithmetic number, because the mean of its divisors is an integer number (33848011).

Almost surely, 2^67696021 is an apocalyptic number.

It is an amenable number.

67696021 is a deficient number, since it is larger than the sum of its proper divisors (1).

67696021 is an equidigital number, since it uses as much as digits as its factorization.

67696021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 67696021 is about 8227.7591724600. The cubic root of 67696021 is about 407.5563970271.

The spelling of 67696021 in words is "sixty-seven million, six hundred ninety-six thousand, twenty-one".