21201013013 has 4 divisors (see below), whose sum is σ = 21203221248. Its totient is φ = 21198804780.

The previous prime is 21201012997. The next prime is 21201013019. The reversal of 21201013013 is 31031010212.

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 21201013013 - 2⁴ = 21201012997 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 (21201013019) 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, 1089653 + ... + 1108938.

It is an arithmetic number, because the mean of its divisors is an integer number (5300805312).

Almost surely, 2^21201013013 is an apocalyptic number.

It is an amenable number.

21201013013 is a deficient number, since it is larger than the sum of its proper divisors (2208235).

21201013013 is an equidigital number, since it uses as much as digits as its factorization.

21201013013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2208234.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21201013013 its reverse (31031010212), we get a palindrome (52232023225).

The spelling of 21201013013 in words is "twenty-one billion, two hundred one million, thirteen thousand, thirteen".