206421151 has 4 divisors (see below), whose sum is σ = 209248912. Its totient is φ = 203593392.

The previous prime is 206421139. The next prime is 206421161. The reversal of 206421151 is 151124602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 151124602 = 2 ⋅75562301.

It is a cyclic number.

It is not a de Polignac number, because 206421151 - 2⁵ = 206421119 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 (206421161) 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, 1413771 + ... + 1413916.

It is an arithmetic number, because the mean of its divisors is an integer number (52312228).

Almost surely, 2^206421151 is an apocalyptic number.

206421151 is a deficient number, since it is larger than the sum of its proper divisors (2827761).

206421151 is an equidigital number, since it uses as much as digits as its factorization.

206421151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2827760.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 206421151 is about 14367.3640936673. The cubic root of 206421151 is about 590.9962589579.

Adding to 206421151 its reverse (151124602), we get a palindrome (357545753).

The spelling of 206421151 in words is "two hundred six million, four hundred twenty-one thousand, one hundred fifty-one".