168221001 has 32 divisors (see below), whose sum is σ = 256773888. Its totient is φ = 97044480.

The previous prime is 168220963. The next prime is 168221021. The reversal of 168221001 is 100122861.

It is not a de Polignac number, because 168221001 - 2¹³ = 168212809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (168221021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 322621 + ... + 323141.

It is an arithmetic number, because the mean of its divisors is an integer number (8024184).

Almost surely, 2^168221001 is an apocalyptic number.

It is an amenable number.

168221001 is a deficient number, since it is larger than the sum of its proper divisors (88552887).

168221001 is a wasteful number, since it uses less digits than its factorization.

168221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 168221001 is about 12970.0038936000. The cubic root of 168221001 is about 552.0266836240.

Adding to 168221001 its reverse (100122861), we get a palindrome (268343862).

The spelling of 168221001 in words is "one hundred sixty-eight million, two hundred twenty-one thousand, one".