21312001010213 has 4 divisors (see below), whose sum is σ = 21313449146220. Its totient is φ = 21310552874208.

The previous prime is 21312001010207. The next prime is 21312001010219. The reversal of 21312001010213 is 31201010021312.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21312001010207) and next prime (21312001010219).

It can be written as a sum of positive squares in 2 ways, for example, as 6863472551329 + 14448528458884 = 2619823^2 + 3801122^2 .

It is a cyclic number.

It is not a de Polignac number, because 21312001010213 - 2⁶ = 21312001010149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21312001010191 and 21312001010200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312001010219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 724045928 + ... + 724075361.

It is an arithmetic number, because the mean of its divisors is an integer number (5328362286555).

Almost surely, 2^{21312001010213} is an apocalyptic number.

It is an amenable number.

21312001010213 is a deficient number, since it is larger than the sum of its proper divisors (1448136007).

21312001010213 is a wasteful number, since it uses less digits than its factorization.

21312001010213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1448136006.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21312001010213 its reverse (31201010021312), we get a palindrome (52513011031525).

It can be divided in two parts, 2131200 and 1010213, that added together give a palindrome (3141413).

The spelling of 21312001010213 in words is "twenty-one trillion, three hundred twelve billion, one million, ten thousand, two hundred thirteen".