206247421 has 8 divisors (see below), whose sum is σ = 214208640. Its totient is φ = 198435168.

The previous prime is 206247407. The next prime is 206247467. The reversal of 206247421 is 124742602.

It is a happy number.

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 206247421 - 2¹¹ = 206245373 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 206247421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206247121) 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, 34416 + ... + 39961.

It is an arithmetic number, because the mean of its divisors is an integer number (26776080).

Almost surely, 2^206247421 is an apocalyptic number.

It is an amenable number.

206247421 is a deficient number, since it is larger than the sum of its proper divisors (7961219).

206247421 is an equidigital number, since it uses as much as digits as its factorization.

206247421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74483.

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 206247421 is about 14361.3168268094. The cubic root of 206247421 is about 590.8304125843.

The spelling of 206247421 in words is "two hundred six million, two hundred forty-seven thousand, four hundred twenty-one".