67722121 has 2 divisors, whose sum is σ = 67722122. Its totient is φ = 67722120.

The previous prime is 67722077. The next prime is 67722131. The reversal of 67722121 is 12122776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66650896 + 1071225 = 8164^2 + 1035^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67722121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 67722121.

It is not a weakly prime, because it can be changed into another prime (67722131) 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, 33861060 + 33861061.

It is an arithmetic number, because the mean of its divisors is an integer number (33861061).

Almost surely, 2^67722121 is an apocalyptic number.

It is an amenable number.

67722121 is a deficient number, since it is larger than the sum of its proper divisors (1).

67722121 is an equidigital number, since it uses as much as digits as its factorization.

67722121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2352, while the sum is 28.

The square root of 67722121 is about 8229.3451136770. The cubic root of 67722121 is about 407.6087676837.

Adding to 67722121 its reverse (12122776), we get a palindrome (79844897).

The spelling of 67722121 in words is "sixty-seven million, seven hundred twenty-two thousand, one hundred twenty-one".