208090421 has 32 divisors (see below), whose sum is σ = 278691840. Its totient is φ = 150393600.

The previous prime is 208090417. The next prime is 208090439. The reversal of 208090421 is 124090802.

It is not a de Polignac number, because 208090421 - 2² = 208090417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208090021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91820 + ... + 94058.

It is an arithmetic number, because the mean of its divisors is an integer number (8709120).

Almost surely, 2^208090421 is an apocalyptic number.

It is an amenable number.

208090421 is a deficient number, since it is larger than the sum of its proper divisors (70601419).

208090421 is a wasteful number, since it uses less digits than its factorization.

208090421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2345.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 208090421 is about 14425.3395453972. The cubic root of 208090421 is about 592.5850576078.

The spelling of 208090421 in words is "two hundred eight million, ninety thousand, four hundred twenty-one".