21212101003 has 4 divisors (see below), whose sum is σ = 22134366288. Its totient is φ = 20289835720.

The previous prime is 21212100983. The next prime is 21212101039. The reversal of 21212101003 is 30010121212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21212101003 - 2⁹ = 21212100491 is a prime.

It is a super-3 number, since 3×21212101003³ (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 (21212101403) 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 3 ways as a sum of consecutive naturals, for example, 461132608 + ... + 461132653.

It is an arithmetic number, because the mean of its divisors is an integer number (5533591572).

Almost surely, 2^21212101003 is an apocalyptic number.

21212101003 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21212101003 is a deficient number, since it is larger than the sum of its proper divisors (922265285).

21212101003 is an equidigital number, since it uses as much as digits as its factorization.

21212101003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922265284.

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

Adding to 21212101003 its reverse (30010121212), we get a palindrome (51222222215).

The spelling of 21212101003 in words is "twenty-one billion, two hundred twelve million, one hundred one thousand, three".