21002012323 has 8 divisors (see below), whose sum is σ = 21715328880. Its totient is φ = 20298270720.

The previous prime is 21002012321. The next prime is 21002012329. The reversal of 21002012323 is 32321020012.

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

It is a cyclic number.

It is not a de Polignac number, because 21002012323 - 2¹ = 21002012321 is a prime.

It is a super-4 number, since 4×21002012323⁴ (a number of 42 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21002012297 and 21002012306.

It is not an unprimeable number, because it can be changed into a prime (21002012321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2389278 + ... + 2398051.

It is an arithmetic number, because the mean of its divisors is an integer number (2714416110).

Almost surely, 2^21002012323 is an apocalyptic number.

21002012323 is a deficient number, since it is larger than the sum of its proper divisors (713316557).

21002012323 is a wasteful number, since it uses less digits than its factorization.

21002012323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4787477.

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

Adding to 21002012323 its reverse (32321020012), we get a palindrome (53323032335).

The spelling of 21002012323 in words is "twenty-one billion, two million, twelve thousand, three hundred twenty-three".