21300052213 has 4 divisors (see below), whose sum is σ = 23236420608. Its totient is φ = 19363683820.

The previous prime is 21300052187. The next prime is 21300052223. The reversal of 21300052213 is 31225000312.

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 21300052213 - 2¹⁷ = 21299921141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21300052223) 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, 968184181 + ... + 968184202.

It is an arithmetic number, because the mean of its divisors is an integer number (5809105152).

Almost surely, 2^21300052213 is an apocalyptic number.

It is an amenable number.

21300052213 is a deficient number, since it is larger than the sum of its proper divisors (1936368395).

21300052213 is a wasteful number, since it uses less digits than its factorization.

21300052213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1936368394.

The product of its (nonzero) digits is 360, while the sum is 19.

Adding to 21300052213 its reverse (31225000312), we get a palindrome (52525052525).

The spelling of 21300052213 in words is "twenty-one billion, three hundred million, fifty-two thousand, two hundred thirteen".