168195621 has 16 divisors (see below), whose sum is σ = 253085760. Its totient is φ = 98421120.

The previous prime is 168195593. The next prime is 168195631. The reversal of 168195621 is 126591861.

It is not a de Polignac number, because 168195621 - 2⁵ = 168195589 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 168195621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168195631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86920 + ... + 88833.

It is an arithmetic number, because the mean of its divisors is an integer number (15817860).

Almost surely, 2^168195621 is an apocalyptic number.

168195621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

168195621 is a deficient number, since it is larger than the sum of its proper divisors (84890139).

168195621 is a wasteful number, since it uses less digits than its factorization.

168195621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175796.

The product of its digits is 25920, while the sum is 39.

The square root of 168195621 is about 12969.0254452677. The cubic root of 168195621 is about 551.9989202615.

The spelling of 168195621 in words is "one hundred sixty-eight million, one hundred ninety-five thousand, six hundred twenty-one".