206554421 has 4 divisors (see below), whose sum is σ = 215535072. Its totient is φ = 197573772.

The previous prime is 206554399. The next prime is 206554429. The reversal of 206554421 is 124455602.

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, and also an emirpimes, since its reverse is a distinct semiprime: 124455602 = 2 ⋅62227801.

It is not a de Polignac number, because 206554421 - 2¹⁰ = 206553397 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 (206554429) 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, 4490291 + ... + 4490336.

It is an arithmetic number, because the mean of its divisors is an integer number (53883768).

Almost surely, 2^206554421 is an apocalyptic number.

It is an amenable number.

206554421 is a deficient number, since it is larger than the sum of its proper divisors (8980651).

206554421 is an equidigital number, since it uses as much as digits as its factorization.

206554421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8980650.

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 206554421 is about 14372.0012872251. The cubic root of 206554421 is about 591.1234182904.

The spelling of 206554421 in words is "two hundred six million, five hundred fifty-four thousand, four hundred twenty-one".