21021210003 has 8 divisors (see below), whose sum is σ = 28196114688. Its totient is φ = 13930222664.

The previous prime is 21021209983. The next prime is 21021210029. The reversal of 21021210003 is 30001212012.

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 21021210003 - 2²⁵ = 20987655571 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21021910003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20978751 + ... + 20979752.

It is an arithmetic number, because the mean of its divisors is an integer number (3524514336).

Almost surely, 2^21021210003 is an apocalyptic number.

21021210003 is a deficient number, since it is larger than the sum of its proper divisors (7174904685).

21021210003 is a wasteful number, since it uses less digits than its factorization.

21021210003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41958673.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21021210003 its reverse (30001212012), we get a palindrome (51022422015).

The spelling of 21021210003 in words is "twenty-one billion, twenty-one million, two hundred ten thousand, three".