21021100003 has 4 divisors (see below), whose sum is σ = 21229229808. Its totient is φ = 20812970200.

The previous prime is 21021099991. The next prime is 21021100019. The reversal of 21021100003 is 30000112012.

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 21021100003 - 2¹³ = 21021091811 is a prime.

It is a super-2 number, since 2×21021100003² (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 (21021100073) 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, 104064751 + ... + 104064952.

It is an arithmetic number, because the mean of its divisors is an integer number (5307307452).

Almost surely, 2^21021100003 is an apocalyptic number.

21021100003 is a deficient number, since it is larger than the sum of its proper divisors (208129805).

21021100003 is a wasteful number, since it uses less digits than its factorization.

21021100003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208129804.

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 21021100003 its reverse (30000112012), we get a palindrome (51021212015).

The spelling of 21021100003 in words is "twenty-one billion, twenty-one million, one hundred thousand, three".