20321101646213 has 4 divisors (see below), whose sum is σ = 21204627804768. Its totient is φ = 19437575487660.

The previous prime is 20321101646201. The next prime is 20321101646243. The reversal of 20321101646213 is 31264610112302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20321101646213 - 2¹⁰ = 20321101645189 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20321101646213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321101646243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 441763079243 + ... + 441763079288.

It is an arithmetic number, because the mean of its divisors is an integer number (5301156951192).

Almost surely, 2^{20321101646213} is an apocalyptic number.

20321101646213 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20321101646213 is a deficient number, since it is larger than the sum of its proper divisors (883526158555).

20321101646213 is an equidigital number, since it uses as much as digits as its factorization.

20321101646213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883526158554.

The product of its (nonzero) digits is 10368, while the sum is 32.

Adding to 20321101646213 its reverse (31264610112302), we get a palindrome (51585711758515).

The spelling of 20321101646213 in words is "twenty trillion, three hundred twenty-one billion, one hundred one million, six hundred forty-six thousand, two hundred thirteen".