206442621 has 64 divisors (see below), whose sum is σ = 385228800. Its totient is φ = 106142400.

The previous prime is 206442589. The next prime is 206442631. The reversal of 206442621 is 126244602.

It is not a de Polignac number, because 206442621 - 2⁵ = 206442589 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206442631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 226156 + ... + 227066.

It is an arithmetic number, because the mean of its divisors is an integer number (6019200).

Almost surely, 2^206442621 is an apocalyptic number.

206442621 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

206442621 is a deficient number, since it is larger than the sum of its proper divisors (178786179).

206442621 is a wasteful number, since it uses less digits than its factorization.

206442621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047 (or 1041 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 206442621 is about 14368.1112537452. Note that the first 3 decimals coincide. The cubic root of 206442621 is about 591.0167482177.

The spelling of 206442621 in words is "two hundred six million, four hundred forty-two thousand, six hundred twenty-one".