68199821 has 4 divisors (see below), whose sum is σ = 68238144. Its totient is φ = 68161500.

The previous prime is 68199809. The next prime is 68199823. The reversal of 68199821 is 12899186.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68199821 - 2⁶ = 68199757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68199823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16355 + ... + 20096.

It is an arithmetic number, because the mean of its divisors is an integer number (17059536).

Almost surely, 2^68199821 is an apocalyptic number.

It is an amenable number.

68199821 is a deficient number, since it is larger than the sum of its proper divisors (38323).

68199821 is a wasteful number, since it uses less digits than its factorization.

68199821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38322.

The product of its digits is 62208, while the sum is 44.

The square root of 68199821 is about 8258.3182912746. The cubic root of 68199821 is about 408.5649233355.

The spelling of 68199821 in words is "sixty-eight million, one hundred ninety-nine thousand, eight hundred twenty-one".