21002342303 has 16 divisors (see below), whose sum is σ = 22829322240. Its totient is φ = 19247997600.

The previous prime is 21002342297. The next prime is 21002342363. The reversal of 21002342303 is 30324320012.

It is a cyclic number.

It is not a de Polignac number, because 21002342303 - 2⁸ = 21002342047 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 (21002342363) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2231738 + ... + 2241128.

It is an arithmetic number, because the mean of its divisors is an integer number (1426832640).

Almost surely, 2^21002342303 is an apocalyptic number.

21002342303 is a deficient number, since it is larger than the sum of its proper divisors (1826979937).

21002342303 is a wasteful number, since it uses less digits than its factorization.

21002342303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13238.

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 21002342303 its reverse (30324320012), we get a palindrome (51326662315).

The spelling of 21002342303 in words is "twenty-one billion, two million, three hundred forty-two thousand, three hundred three".