21212112003 has 8 divisors (see below), whose sum is σ = 28283521728. Its totient is φ = 14141055144.

The previous prime is 21212111969. The next prime is 21212112007. The reversal of 21212112003 is 30021121212.

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

It is not a de Polignac number, because 21212112003 - 2²² = 21207917699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21212112007) 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, 127200 + ... + 242082.

It is an arithmetic number, because the mean of its divisors is an integer number (3535440216).

Almost surely, 2^21212112003 is an apocalyptic number.

21212112003 is a deficient number, since it is larger than the sum of its proper divisors (7071409725).

21212112003 is a wasteful number, since it uses less digits than its factorization.

21212112003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176433.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21212112003 its reverse (30021121212), we get a palindrome (51233233215).

The spelling of 21212112003 in words is "twenty-one billion, two hundred twelve million, one hundred twelve thousand, three".