208416021 has 8 divisors (see below), whose sum is σ = 303150624. Its totient is φ = 126312720.

The previous prime is 208415993. The next prime is 208416053. The reversal of 208416021 is 120614802.

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

It is not a de Polignac number, because 208416021 - 2⁵ = 208415989 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 208415982 and 208416000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208416121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3157786 + ... + 3157851.

It is an arithmetic number, because the mean of its divisors is an integer number (37893828).

Almost surely, 2^208416021 is an apocalyptic number.

It is an amenable number.

208416021 is a deficient number, since it is larger than the sum of its proper divisors (94734603).

208416021 is a wasteful number, since it uses less digits than its factorization.

208416021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6315651.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 208416021 is about 14436.6208303744. The cubic root of 208416021 is about 592.8939700298.

It can be divided in two parts, 20841 and 6021, that added together give a palindrome (26862).

The spelling of 208416021 in words is "two hundred eight million, four hundred sixteen thousand, twenty-one".