21002002210013 has 4 divisors (see below), whose sum is σ = 22911275138208. Its totient is φ = 19092729281820.

The previous prime is 21002002210009. The next prime is 21002002210031. The reversal of 21002002210013 is 31001220020012.

It is a happy number.

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 21002002210013 - 2² = 21002002210009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21002002210013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002002210043) 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, 954636464081 + ... + 954636464102.

It is an arithmetic number, because the mean of its divisors is an integer number (5727818784552).

Almost surely, 2^{21002002210013} is an apocalyptic number.

It is an amenable number.

21002002210013 is a deficient number, since it is larger than the sum of its proper divisors (1909272928195).

21002002210013 is a wasteful number, since it uses less digits than its factorization.

21002002210013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1909272928194.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21002002210013 its reverse (31001220020012), we get a palindrome (52003222230025).

The spelling of 21002002210013 in words is "twenty-one trillion, two billion, two million, two hundred ten thousand, thirteen".