21002020012303 has 4 divisors (see below), whose sum is σ = 22911294558888. Its totient is φ = 19092745465720.

The previous prime is 21002020012291. The next prime is 21002020012313. The reversal of 21002020012303 is 30321002020012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21002020012303 - 2¹³ = 21002020004111 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 (21002020012313) 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, 954637273276 + ... + 954637273297.

It is an arithmetic number, because the mean of its divisors is an integer number (5727823639722).

Almost surely, 2^{21002020012303} is an apocalyptic number.

21002020012303 is a deficient number, since it is larger than the sum of its proper divisors (1909274546585).

21002020012303 is a wasteful number, since it uses less digits than its factorization.

21002020012303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1909274546584.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21002020012303 its reverse (30321002020012), we get a palindrome (51323022032315).

The spelling of 21002020012303 in words is "twenty-one trillion, two billion, twenty million, twelve thousand, three hundred three".