208237421 has 8 divisors (see below), whose sum is σ = 239502720. Its totient is φ = 177351408.

The previous prime is 208237411. The next prime is 208237439. The reversal of 208237421 is 124732802.

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 208237421 - 2⁶ = 208237357 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 (208237411) 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, 93641 + ... + 95838.

It is an arithmetic number, because the mean of its divisors is an integer number (29937840).

Almost surely, 2^208237421 is an apocalyptic number.

It is an amenable number.

208237421 is a deficient number, since it is larger than the sum of its proper divisors (31265299).

208237421 is a wasteful number, since it uses less digits than its factorization.

208237421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189643.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 208237421 is about 14430.4338465619. The cubic root of 208237421 is about 592.7245634677.

The spelling of 208237421 in words is "two hundred eight million, two hundred thirty-seven thousand, four hundred twenty-one".