21213202313 has 4 divisors (see below), whose sum is σ = 21225388548. Its totient is φ = 21201016080.

The previous prime is 21213202301. The next prime is 21213202337. The reversal of 21213202313 is 31320231212.

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 1599760009 + 19613442304 = 39997^2 + 140048^2 .

It is a cyclic number.

It is not a de Polignac number, because 21213202313 - 2⁶ = 21213202249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21213202343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6090506 + ... + 6093987.

It is an arithmetic number, because the mean of its divisors is an integer number (5306347137).

Almost surely, 2^21213202313 is an apocalyptic number.

It is an amenable number.

21213202313 is a deficient number, since it is larger than the sum of its proper divisors (12186235).

21213202313 is a wasteful number, since it uses less digits than its factorization.

21213202313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12186234.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21213202313 its reverse (31320231212), we get a palindrome (52533433525).

The spelling of 21213202313 in words is "twenty-one billion, two hundred thirteen million, two hundred two thousand, three hundred thirteen".