21002343023 has 8 divisors (see below), whose sum is σ = 21052262208. Its totient is φ = 20952476064.

The previous prime is 21002342993. The next prime is 21002343053. The reversal of 21002343023 is 32034320012.

It is an interprime number because it is at equal distance from previous prime (21002342993) and next prime (21002343053).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21002343023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21002342986 and 21002343004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002343053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 860261 + ... + 884337.

It is an arithmetic number, because the mean of its divisors is an integer number (2631532776).

Almost surely, 2^21002343023 is an apocalyptic number.

21002343023 is a deficient number, since it is larger than the sum of its proper divisors (49919185).

21002343023 is a wasteful number, since it uses less digits than its factorization.

21002343023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26113.

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

Adding to 21002343023 its reverse (32034320012), we get a palindrome (53036663035).

The spelling of 21002343023 in words is "twenty-one billion, two million, three hundred forty-three thousand, twenty-three".