206631246302221 has 8 divisors (see below), whose sum is σ = 222655257962424. Its totient is φ = 190625706128640.

The previous prime is 206631246302219. The next prime is 206631246302347. The reversal of 206631246302221 is 122203642136602.

It can be written as a sum of positive squares in 4 ways, for example, as 48507185384100 + 158124060918121 = 6964710^2 + 12574739^2 .

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 206631246302221 - 2¹ = 206631246302219 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 (206631246302821) 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, 4617848416 + ... + 4617893161.

It is an arithmetic number, because the mean of its divisors is an integer number (27831907245303).

Almost surely, 2^{206631246302221} is an apocalyptic number.

It is an amenable number.

206631246302221 is a deficient number, since it is larger than the sum of its proper divisors (16024011660203).

206631246302221 is a wasteful number, since it uses less digits than its factorization.

206631246302221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9235743311.

The product of its (nonzero) digits is 248832, while the sum is 40.

Adding to 206631246302221 its reverse (122203642136602), we get a palindrome (328834888438823).

The spelling of 206631246302221 in words is "two hundred six trillion, six hundred thirty-one billion, two hundred forty-six million, three hundred two thousand, two hundred twenty-one".