21201013213 has 4 divisors (see below), whose sum is σ = 21560352480. Its totient is φ = 20841673948.

The previous prime is 21201013199. The next prime is 21201013237. The reversal of 21201013213 is 31231010212.

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 21201013213 - 2¹⁷ = 21200882141 is a prime.

It is a super-2 number, since 2×21201013213² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201010213) 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, 179669545 + ... + 179669662.

It is an arithmetic number, because the mean of its divisors is an integer number (5390088120).

Almost surely, 2^21201013213 is an apocalyptic number.

It is an amenable number.

21201013213 is a deficient number, since it is larger than the sum of its proper divisors (359339267).

21201013213 is an equidigital number, since it uses as much as digits as its factorization.

21201013213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359339266.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21201013213 its reverse (31231010212), we get a palindrome (52432023425).

The spelling of 21201013213 in words is "twenty-one billion, two hundred one million, thirteen thousand, two hundred thirteen".