68322421 has 2 divisors, whose sum is σ = 68322422. Its totient is φ = 68322420.

The previous prime is 68322409. The next prime is 68322427. The reversal of 68322421 is 12422386.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60621796 + 7700625 = 7786^2 + 2775^2 .

It is a cyclic number.

It is not a de Polignac number, because 68322421 - 2⁹ = 68321909 is a prime.

It is a super-2 number, since 2×68322421² = 9335906422602482, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 68322421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68322427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34161210 + 34161211.

It is an arithmetic number, because the mean of its divisors is an integer number (34161211).

Almost surely, 2^68322421 is an apocalyptic number.

It is an amenable number.

68322421 is a deficient number, since it is larger than the sum of its proper divisors (1).

68322421 is an equidigital number, since it uses as much as digits as its factorization.

68322421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 28.

The square root of 68322421 is about 8265.7377771134. The cubic root of 68322421 is about 408.8095968740.

It can be divided in two parts, 683 and 22421, that added together give a square (23104 = 152²).

The spelling of 68322421 in words is "sixty-eight million, three hundred twenty-two thousand, four hundred twenty-one".