168421037 has 2 divisors, whose sum is σ = 168421038. Its totient is φ = 168421036.

The previous prime is 168421007. The next prime is 168421039. The reversal of 168421037 is 730124861.

168421037 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109223401 + 59197636 = 10451^2 + 7694^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168421037 is a prime.

Together with 168421039, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 168420994 and 168421012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168421039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84210518 + 84210519.

It is an arithmetic number, because the mean of its divisors is an integer number (84210519).

Almost surely, 2^168421037 is an apocalyptic number.

It is an amenable number.

168421037 is a deficient number, since it is larger than the sum of its proper divisors (1).

168421037 is an equidigital number, since it uses as much as digits as its factorization.

168421037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 168421037 is about 12977.7130882140. The cubic root of 168421037 is about 552.2454067483.

Adding to 168421037 its reverse (730124861), we get a palindrome (898545898).

The spelling of 168421037 in words is "one hundred sixty-eight million, four hundred twenty-one thousand, thirty-seven".