67402921 has 2 divisors, whose sum is σ = 67402922. Its totient is φ = 67402920.

The previous prime is 67402913. The next prime is 67402997. The reversal of 67402921 is 12920476.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65610000 + 1792921 = 8100^2 + 1339^2 .

It is a cyclic number.

It is not a de Polignac number, because 67402921 - 2³ = 67402913 is a prime.

It is not a weakly prime, because it can be changed into another prime (67102921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33701460 + 33701461.

It is an arithmetic number, because the mean of its divisors is an integer number (33701461).

Almost surely, 2^67402921 is an apocalyptic number.

It is an amenable number.

67402921 is a deficient number, since it is larger than the sum of its proper divisors (1).

67402921 is an equidigital number, since it uses as much as digits as its factorization.

67402921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 67402921 is about 8209.9281970064. The cubic root of 67402921 is about 406.9673540614.

The spelling of 67402921 in words is "sixty-seven million, four hundred two thousand, nine hundred twenty-one".