168821213 has 8 divisors (see below), whose sum is σ = 193861920. Its totient is φ = 145396080.

The previous prime is 168821207. The next prime is 168821239. The reversal of 168821213 is 312128861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 168821213 - 2⁸ = 168820957 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 168821213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168821293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 403670 + ... + 404087.

It is an arithmetic number, because the mean of its divisors is an integer number (24232740).

Almost surely, 2^168821213 is an apocalyptic number.

It is an amenable number.

168821213 is a deficient number, since it is larger than the sum of its proper divisors (25040707).

168821213 is a wasteful number, since it uses less digits than its factorization.

168821213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807787.

The product of its digits is 4608, while the sum is 32.

The square root of 168821213 is about 12993.1217572991. The cubic root of 168821213 is about 552.6824474744.

The spelling of 168821213 in words is "one hundred sixty-eight million, eight hundred twenty-one thousand, two hundred thirteen".