206546421 has 4 divisors (see below), whose sum is σ = 275395232. Its totient is φ = 137697612.

The previous prime is 206546401. The next prime is 206546437. The reversal of 206546421 is 124645602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 206546421 - 2⁶ = 206546357 is a prime.

It is a super-2 number, since 2×206546421² = 85322848055818482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206546401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34424401 + ... + 34424406.

It is an arithmetic number, because the mean of its divisors is an integer number (68848808).

Almost surely, 2^206546421 is an apocalyptic number.

It is an amenable number.

206546421 is a deficient number, since it is larger than the sum of its proper divisors (68848811).

206546421 is an equidigital number, since it uses as much as digits as its factorization.

206546421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68848810.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 206546421 is about 14371.7229656016. The cubic root of 206546421 is about 591.1157866480.

The spelling of 206546421 in words is "two hundred six million, five hundred forty-six thousand, four hundred twenty-one".