206421263 has 8 divisors (see below), whose sum is σ = 217659120. Its totient is φ = 195220800.

The previous prime is 206421239. The next prime is 206421277. The reversal of 206421263 is 362124602.

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

It is a cyclic number.

It is not a de Polignac number, because 206421263 - 2¹⁴ = 206404879 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 (206421283) 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, 2381 + ... + 20457.

It is an arithmetic number, because the mean of its divisors is an integer number (27207390).

Almost surely, 2^206421263 is an apocalyptic number.

206421263 is a deficient number, since it is larger than the sum of its proper divisors (11237857).

206421263 is a wasteful number, since it uses less digits than its factorization.

206421263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18697.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 206421263 is about 14367.3679913894. The cubic root of 206421263 is about 590.9963658454.

Adding to 206421263 its reverse (362124602), we get a palindrome (568545865).

The spelling of 206421263 in words is "two hundred six million, four hundred twenty-one thousand, two hundred sixty-three".