21212110003 has 8 divisors (see below), whose sum is σ = 25024424960. Its totient is φ = 17595298440.

The previous prime is 21212109967. The next prime is 21212110013. The reversal of 21212110003 is 30001121212.

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-21212110003 is a prime.

It is a super-3 number, since 3×21212110003³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212110013) 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, 48875613 + ... + 48876046.

It is an arithmetic number, because the mean of its divisors is an integer number (3128053120).

Almost surely, 2^21212110003 is an apocalyptic number.

21212110003 is a deficient number, since it is larger than the sum of its proper divisors (3812314957).

21212110003 is an equidigital number, since it uses as much as digits as its factorization.

21212110003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97751697.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21212110003 its reverse (30001121212), we get a palindrome (51213231215).

The spelling of 21212110003 in words is "twenty-one billion, two hundred twelve million, one hundred ten thousand, three".