21213313201 has 4 divisors (see below), whose sum is σ = 22461155172. Its totient is φ = 19965471232.

The previous prime is 21213313171. The next prime is 21213313207. The reversal of 21213313201 is 10231331212.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8422834176 + 12790479025 = 91776^2 + 113095^2 .

It is a cyclic number.

It is not a de Polignac number, because 21213313201 - 2⁵ = 21213313169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21213313207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 623920960 + ... + 623920993.

It is an arithmetic number, because the mean of its divisors is an integer number (5615288793).

Almost surely, 2^21213313201 is an apocalyptic number.

It is an amenable number.

21213313201 is a deficient number, since it is larger than the sum of its proper divisors (1247841971).

21213313201 is a wasteful number, since it uses less digits than its factorization.

21213313201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247841970.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21213313201 its reverse (10231331212), we get a palindrome (31444644413).

The spelling of 21213313201 in words is "twenty-one billion, two hundred thirteen million, three hundred thirteen thousand, two hundred one".