206150021 has 8 divisors (see below), whose sum is σ = 257018304. Its totient is φ = 160636320.

The previous prime is 206150011. The next prime is 206150027. The reversal of 206150021 is 120051602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206150021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206150027) 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, 1338560 + ... + 1338713.

It is an arithmetic number, because the mean of its divisors is an integer number (32127288).

Almost surely, 2^206150021 is an apocalyptic number.

It is an amenable number.

206150021 is a deficient number, since it is larger than the sum of its proper divisors (50868283).

206150021 is a wasteful number, since it uses less digits than its factorization.

206150021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2677291.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 206150021 is about 14357.9253724206. The cubic root of 206150021 is about 590.7373917147.

The spelling of 206150021 in words is "two hundred six million, one hundred fifty thousand, twenty-one".