208814021 has 4 divisors (see below), whose sum is σ = 224876652. Its totient is φ = 192751392.

The previous prime is 208814017. The next prime is 208814027. The reversal of 208814021 is 120418802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42120100 + 166693921 = 6490^2 + 12911^2 .

It is a cyclic number.

It is not a de Polignac number, because 208814021 - 2² = 208814017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208814027) 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, 8031296 + ... + 8031321.

It is an arithmetic number, because the mean of its divisors is an integer number (56219163).

Almost surely, 2^208814021 is an apocalyptic number.

It is an amenable number.

208814021 is a deficient number, since it is larger than the sum of its proper divisors (16062631).

208814021 is a wasteful number, since it uses less digits than its factorization.

208814021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16062630.

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 208814021 is about 14450.3986450201. The cubic root of 208814021 is about 593.2711351359.

The spelling of 208814021 in words is "two hundred eight million, eight hundred fourteen thousand, twenty-one".