206925221 has 4 divisors (see below), whose sum is σ = 207167532. Its totient is φ = 206682912.

The previous prime is 206925209. The next prime is 206925233. The reversal of 206925221 is 122529602.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (206925209) and next prime (206925233).

It can be written as a sum of positive squares in 2 ways, for example, as 178516321 + 28408900 = 13361^2 + 5330^2 .

It is a cyclic number.

It is not a de Polignac number, because 206925221 - 2⁶ = 206925157 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 (206925281) 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, 119870 + ... + 121583.

It is an arithmetic number, because the mean of its divisors is an integer number (51791883).

Almost surely, 2^206925221 is an apocalyptic number.

It is an amenable number.

206925221 is a deficient number, since it is larger than the sum of its proper divisors (242311).

206925221 is an equidigital number, since it uses as much as digits as its factorization.

206925221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242310.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 206925221 is about 14384.8955853006. The cubic root of 206925221 is about 591.4769288938.

The spelling of 206925221 in words is "two hundred six million, nine hundred twenty-five thousand, two hundred twenty-one".