21340021003 has 8 divisors (see below), whose sum is σ = 24389526272. Its totient is φ = 18290748456.

The previous prime is 21340020991. The next prime is 21340021039. The reversal of 21340021003 is 30012004312.

It is a happy number.

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-21340021003 is a prime.

It is a super-2 number, since 2×21340021003² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21340001003) 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, 240676 + ... + 317182.

It is an arithmetic number, because the mean of its divisors is an integer number (3048690784).

Almost surely, 2^21340021003 is an apocalyptic number.

21340021003 is a deficient number, since it is larger than the sum of its proper divisors (3049505269).

21340021003 is an equidigital number, since it uses as much as digits as its factorization.

21340021003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116361.

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

Adding to 21340021003 its reverse (30012004312), we get a palindrome (51352025315).

The spelling of 21340021003 in words is "twenty-one billion, three hundred forty million, twenty-one thousand, three".