646306102221 has 32 divisors (see below), whose sum is σ = 982996777728. Its totient is φ = 374187310080.

The previous prime is 646306102207. The next prime is 646306102223. The reversal of 646306102221 is 122201603646.

It is not a de Polignac number, because 646306102221 - 2⁶ = 646306102157 is a prime.

It is a super-2 number, since 2×646306102221² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646306102223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1551760 + ... + 1923686.

It is an arithmetic number, because the mean of its divisors is an integer number (30718649304).

Almost surely, 2^646306102221 is an apocalyptic number.

It is an amenable number.

646306102221 is a deficient number, since it is larger than the sum of its proper divisors (336690675507).

646306102221 is a wasteful number, since it uses less digits than its factorization.

646306102221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374581.

The product of its (nonzero) digits is 20736, while the sum is 33.

Adding to 646306102221 its reverse (122201603646), we get a palindrome (768507705867).

The spelling of 646306102221 in words is "six hundred forty-six billion, three hundred six million, one hundred two thousand, two hundred twenty-one".